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Native Australian and New Guinean citrus

Australian finger limes

Eremolemons

Botanical classification of Oceanian citrus varieties

History
Distribution
Uses

Australian finger lime Citrus australasica
Cultivated finger lime varieties
Wild Fingerlime's Citrus Caviar varieties
Faustrime
Australian Sunrise Lime
Red finger lime Citrus australasica var. sanguinea
Australian Blood Lime
Australian Round lime Citrus australis
Sydney hybrid Citrus × virgata
Mount White lime Citrus garrawayae
Russel River lime Citrus inodora
Maiden's Australian wild lime Citrus maideniana
Humpty Doo lime Citrus gracilis
Australian desert lime Citrus glauca
Australian Outback lime
Eremolemon

Brown River finger lime Citrus wintersii
New Guinea wild lime Citrus warburgiana

Botanical classification of Native Australian citrus types

W.T. Swingle (1871 - 1952) assigned these citrus types to the genera Microcitrus and Eremocitrus based on several characteristics that in his mind botanically separated them from the genus Citrus. These are listed in his work "The Botany of Citrus", in Microcitrus and Eremocitrus. Swingle was familiar with the work of both F.M. Mueller (1825 - 1896), Government Botanist of Victoria and F.M. Bailey (1827-1915), Colonial Botanist of Queensland. Both botanists active in Australia originally included these types in the genus Citrus.

Well-known botanists of our time continue this tradition, D.J. Mabberley (b.1948), since 2005 president of IATP, perhaps the most notable among them. A 1998 paper of his Australian Citrae with notes on other Aurantioideae discusses the issue of Australian native citrus classification. However, the re-application of the genus Citrus is not an attempt to raise the status of the native Australian Citrus types but an automatic consequence of the Tokyo Code of 1994, which stipulates that after 1994 the oldest correct classification of a plant is the valid one.

In this presentation, the genus Citrus is used followed by the synonyms Microcitrus and Eremocitrus as well as several other historical classifications.

The citrus types previously known as Microcitrus

History

The seven species of Citrus previously known as Microcitrus are the result of millions of years of slow evolution from a primitive ancestral types. This type may have resembled C. warburgiana, the New Guinea species, which has small leaves and small, nearly spherical fruits. From such an ancestral form, one line of evolution produced the so-called native orange, round lime, or Dooja (C. australis), that grows to a large tree and has subglobose fruits much larger than those of C. warburgiana, with long, slender, pointed, more or less twisted pulp-vesicles. Another line of evolution culminated in C. inodora and C. maideniana, highly specialized forms showing adaptations to tropical rain forests, with large leaves and paired spines; a third line of evolution led to the small-leaved species C. australasica and C. garrawayae, both with long-ovoid or very elongated cylindric fruits.

Distribution

These remarkable citrus fruits are extremely interesting, in that they show how evolution has proceeded in regions isolated as Australia and New Guinea have been during the last twenty or thirty million years since they were cut off from all other land masses. The evolution of other citrus fruits is not so easily followed, since Citrus, Fortunella, and Poncirus did not originate in regions that were geographically isolated in definitely dated geologic eras. The group contains seven species, five of which are native to Australia with the other two found in New Guinea. The Australian species occur in rainforests and their margins from Cape York Peninsula south to the northern rivers of New South Wales. They produce small, round or finger-shaped fruit, with a pleasant but very acid juice.

Uses

They have a close relationship with conventional citrus fruit in the genus Citrus. Australian native citrus species are able to hybridise with a range of other citrus species. This ability, along with drought and salinity tolerance and disease resistance, has long attracted the interest of citrus researchers and breeders. Improved selections and hybrids of native citrus also have potential in their own right for commercial production for both the fresh and high-value processing markets. Fruit is used in a range of sweet and savoury processed products, such as marmalades and sauces, and is in demand by chefs producing ‘Australian Native Cuisine’ dishes. Traditionally most fruit has been harvested from the wild. Commercial orchard production began in the last decades of the twentieth century and because of quality and reliability of supply factors as well as environmental concerns, has slowly started to replace wild harvested fruit.

The citrus types previously known as Eremocitrus

This group contains one species, Citrus glauca, known commonly as the Australian desert lime and its cultivar Outback lime and hybrid Eremolemon. The typical form of this type as it occurs in southeastern Queensland is a small tree or a large shrub, sometimes only a few feet in height. It is the only plant in the whole orange subfamily that is able to survive extreme drought. Its hybrids also include eremoranges, eremoradias (a hybrid with the sour orange) and citrangeremos (a hybrid with citrange).


LAT	Citrus australasica F.Muell.	Various cultivars
Syn	Microcitrus australasica (F.Muell.) Swingle
	Australian finger lime, (Microcitrus australasica), occurs as an understorey shrub or tree in rainforests in southern Queensland and northern New South Wales. It produces finger-shaped fruit, up to 10cm long, with thin green or yellow skin and greenish-yellow compressed juice vesicles that tend to burst out when the skin is cut. A pink to red-fleshed form with red to purple or even black skin (known as Citrus australasica var. sanguinea) also occurs in the wild. Fruits are cylindric, 1.5 - 2.5 cm long, often slightly curved, narrowed at both tip and base. Peel rough with numerous oil glands, greenish-yellow at maturity; pulp-vesicles nearly free or loosely cohering, seeds numerous, small, 6-7 mm long, ovoid, usually flattened on one side. The first leaves are minute linear cataphylls; these gradually merge into juvenile foliage which, in turn, merges into the mature foliage, the leaves of which are smaller than those of any other True Citrus Fruit Tree with the exception of Citrus glauca, when the latter occurs in very dry situations. There numerous selected varieties available for growers. See next entry. Various producers have their own specialties. See Wild Fingerlime below.
ENG	Finger lime, Australian finger lime
FRA	Lime digitée d'Australie
Photos		© Gene Lester
Link


LAT	Citrus australasica F.Muell. Cultivated varieties
Syn	Microcitrus australasica (F.Muell.) Swingle
	The Australian Cultivar Registration Authority Inc. (ACRA) has registered following cultivated varieties of the Australian Finger Lime. 'Alstonville' Originated at Alstonville on the far north coast of NSW and was selected in 1989. A moderately dense tall shrub or small tree to a maximum of 3-4 metres high by 2 metres wide. Axillary spines solitary, straight to 25mm long. Leaves are simple, obovate to elliptic, glabrous. Flowers white (with pink buds) approximately 10-15mm in diameter. Fruit a cylindrical berry, 4-8 cms long, 15-25mm in diameter from August to September (AUS), dark green to black, vescicles translucent pale green. ‘Alstonville’ is a tall growing selection which bears fruit earlier and in large clusters with few to no seeds. Accepted for registration 1 February 2007. 'Blunobia Pink Crystal' A dense medium shrub 2 metres high by 1 metres wide. Axillary spines solitary, straight to 25mm long. Leaves are small and narrow, simple, obovate to elliptic, glabrous, new foliage light green in colour. Flowers white (with pink buds) approximately 10-15mm in diameter from August to September. Fruit a cylindrical berry, 4-8 cms long, 15-25mm in diameter , skin green with brown overtone, vesicles deep pink and easy to extract. ‘Blunobia’ is the name of farm in Mt Burrell, Murwillumbah where originators Jim and Barbara O’Brien live. Cultivar first introduced in 1988. Accepted for registration 1 February 2007. 'Byron Sunrise' Very narrow upright tall shrub or small tree to a maximum of 2 metres high by 600mm wide. Delicate small rounded leaves. Flowers white (with pink buds) approximately 10-15mm in diameter in October (AUS). Fruit a cylindrical berry, 40-80 mms long, 15-25mm in diameter, mottled green/brown to black when fully ripe with clean smooth skin. Flesh is tangerine/red. The flesh/vescicles becomes darker when exposed to air for several hours ‘Byron Sunrise’ is a medium sized selection with a clean smooth skin and a distinctive tangerine/red coloured flesh. Accepted for registration 30 June 2010. 'Durhams Emerald' Durhams Emerald originated in the Northern rivers district and was introduced into cultivation in 1994. A moderately dense medium shrub 2 metres high by 1.7 metres wide with a moderately open appearance. Axillary spines solitary, straight to 25mm long. Leaves are simple, obovate to elliptic, glabrous. Flowers white (with pink buds) approximately 10-15mm in diameter, Aug-Sept (AUS). Fruit a cylindrical berry, 4-8 cms long, 15-25mm in diameter, with firm black skin and emerald green pulp. ‘Durhams Emerald’ is a heavy bearer during Summer to late Autumn, with continual light cropping all year around. Vesicles easy to extract. Accepted for registration February 2007. 'Jali Red' Jali Red originated at Whian Whian. Tall shrub or small tree to a maximum of 2-3 metres high by 2 – 2.5 metres wide with a sparse open appearance. Axillary spines solitary, straight to 25mm long. Leaves are simple, obovate to elliptic, glabrous. Flowers white approximately 10-15mm in diameter. Flowering period July – August (AUS). Fruit a cylindrical berry, 40-80mms long, 15-25mm in diameter, dark green to brown, flesh/vescicles red/pink, 2-3mm in diameter. The flesh/vescicles becomes darker when exposed to air for several hours. Jali Red is an open shrub with a distinctive red/pink flesh. Accepted for registration 30 June 2010. 'Judy's Everbearing' Originated at Binna Burra on the outskirts of Bangalow, northern NSW and was selected in 1993. Name derives from the first name of the applicant and the fact that the cultivar bears fruit throughout the year with its main crop being between summer and autumn. Tall shrub or small tree to a maximum of 3-4 metres high by 2 – 3 metres wide with dense foliage. Axillary spines solitary, straight to 25mm long. Leaves are simple, obovate to elliptic, glabrous. Flowers white (with pink buds) approximately 10-15mm in diameter. Fruit a cylindrical berry, 4-8 cms long, 15-25mm in diameter. ‘Judy’s Everbearing’ is a tall growing selection which bears fruit all year round. Accepted for registration 1 February 2007. 'Pink Ice' Pink Ice originated at Alstonville on the far north coast of NSW and was selected in 1989. A moderately dense tall shrub or small tree to a maximum of 2.5-3 metres high by1.3 metres wide. Axillary spines solitary, straight to 25mm long. Leaves are simple, obovate to elliptic, glabrous. Flowers white approximately 10-15mm in diameter, from July-September (AUS). Fruit a cylindrical berry, 4-8 cms long, 15-25mm in diameter. Variation of skin colour green to brown & pink, vescicles from clear to different shades of pink. Pink Ice is a medium growing selection which bears fruit with vescicles varying from clear/translucent, to deep pink. Accepted for registration 1 February 2007. 'Rainforest Pearl' Citrus australasica var. sanguinea A small open upright tree producing green fruit tinged with crimson with a pink flesh - see Red Finger lime below. More on Growing Australian Fingerlimes from Industry & Investment NSW 2010 . Several producers sell these varieties with their own trade names. Wild Finger Lime with the tradename Citrus Caviar, see below. Finger Limeing Good Pty Limited with the tradename Limeburst.
ENG	Australian finger lime, cultivated varieties
FRA
Photos		Photos by Murray Fagg © Australian National Botanic Gardens


LAT	Citrus australasica F.Muell.
Syn	Microcitrus australasica (F.Muell.) Swingle
	Wild Fingerlime markets finger limes in the subtropics of northern New South Wales, where the finger lime is endemic. Wild Fingerlime has conducted research within the Australian restaurant industry and selected a number of export markets to establish the most desirable cultivars. Wild Fingerlime's Citrus Caviar varieties from top to bottom: Rainforest Ruby 1 Rainforest Garnet 1 Rainforest Jade 1 Rainforest Pearl Rainforest Diamond Rainforest Jade 2 Rainforest Topaz
ENG	Wild Fingerlime's Citrus Caviar varieties
Photo		Photo provided by Wild Fingerlime


LAT	Faustrime
Syn	Citrus australasica F.Muell. × [Citrus × floridana (J. Ingram & H. Moore) Mabb. 'Limequat Eustis' ]
	Faustrime is a trigeneric hybrid of the Australian fingerlime (Microcitrus australasica) and Limequat Eustis, itself a hybrid of Mexican lime (Citrus aurantiifolia) and Round kumquat (Fortunella japonica). It has genes of three citrus fruit genera: Citrus, Microcitrus and Fortunella. The fruit of Faustrime are similar to Finger lime in shape but much larger in size. Faustrime seems to have inherited several characteristics from the Limequat parent. Unlike the Finger lime Faustrime turns yellow when ripe. The juice vesicles of Faustrime are oval whereas the juice vesicles of the Finger lime are round. Faustrime is juicier than Finger lime and the taste is a cross of Mexican lime and Finger lime. In the kitchen Faustrime can be used instead of lime. Faustrime is also grown as an ornamental plant. Disambiguation: Faustrimedin, see below.
ENG	Faustrime
Photos		© Laaz


LAT	Citrus × oliveri Mabb. 'Australian Sunrise'
Syn	Citrus australasica 'Australian Sunrise' Citrus australasica × [(Citrus × microcarpa Bunge) × Citrus reticulata var. austera] Faustrimedin 'Australian Sunrise'
	The Australian Sunrise lime is a seedling of a Faustrimedin (originally bred in California in 1911), a hybrid of the Finger lime (Citrus australasica) and the Calamondin (Citrus × microcarpa), itself a hybrid between the Nagami kumquat (Citrus japonica 'Nagami') and the sour mandarin (Citrus sunki). "Australian Sunrise was identified after the evaluation of 24 seedlings grown from open-pollinated monoembryonic seeds of the Faustrimedin. Seedlings were field-planted in 1977 and monitored for fruit yield and quality characteristics. ‘Australian Sunrise’ was selected from this family of widely variable zygotic seedlings in 1990 when 30 trees were propagated by budding on to citrus rootstocks for further evaluation. The cultivar was selected for its consistent high yield of pyriform-shaped, orange fruits which possessed valuable fruit processing characteristics." Source: Sykes, W.R. (2002) Description. Plant Varieties Journal 15(4): 20-21 The parent tree of the Australian Sunrise lime was selected in 1990 at CSIRO Plant Industry. The variety has been grown commercially since 2001 and was so successful it was made available for home gardeners in 2005. Australian Sunrise produces attractive golden-coloured fruit on an upright shrub to small tree, usually 2 to 3 m high and 1.5 to 2.5 m wide. Foliage is dark, glossy-green. The oval leaves are approximately 40 to 45 mm long by 20 to 30 mm wide. The cream-coloured flowers occur in spring to early summer. Fruits ripen in winter, are pearshaped and usually 30 to 45 mm long by 20 to 40 mm wide. Seeds are small and plump. Juice squeezed from the fruit has a sharp, clean flavour and a light ‘floral’ aroma. The fruit may be eaten whole and like a kumquat, have a sharpish flesh and a sweet albedo and skin. They can be used in products such as in cordials, beverages, conserves, puree, pastes, sauces, marmalade, syrups and garnishes. Disambiguation: Faustrime, see above.
ENG	Australian Sunrise lime
FRA
Photos		© CSIRO Plant Industry


LAT	Citrus australasica var. sanguinea F.M.Bailey
Syn	Microcitrus australasica var.sanguinea (Bailey) Swingle
	Red finger lime, a pink to red-fleshed form of the Australian finger lime with red to purple or even black skin (known as Citrus australasica var. sanguinea) also occurs in the wild. This variety differs from the species in that the pulp-vesicles at maturity vary from pink to red in colour. The red-pulp finger lime has been observed growing throughout the natural distribution of the finger lime. There are similar "pink" or red varieties of oranges (the so-called blood oranges) and grapefruit, some of which are known to have arisen as budsports. However, the red-pulped variety of the Australian finger-lime is found growing wild and can be propagated from seed; it seems to have originated without the aid of man. An Australian finger lime (C. australasica var. sanguinea) cultivar ‘Rainforest Pearl’ was selected for pink pulp, ease of propagation and ornamental properties as a garden subject, including vigour and openness of form. Trees are usually grafted onto Trifoliata or Troyer Citrange rootstocks, are thorny, and although slow to establish, ultimately produce vigorous upright trees 4 to 6m high. Fruit is harvested in late summer and autumn on the north coast of NSW. The variety is registered with Plant Breeders Rights (PBR).
ENG	Red finger lime, Red-pulped finger lime, Red-fleshed finger lime
FRA
Photos		© Petr Broža © Bernhard Voß


LAT	Citrus australasica 'Australian Blood Lime'
Syn	Citrus australasica var. sanguinea × Citrus limonia 'Rangpur'
	Contrary to common belief Australian Blood Lime is not a hybrid of the Red finger lime and the 'Ellendale' mandarin. It is a hybrid where the pollen parent is the said Red finger lime (Citrus australasica var. sanguinea) and seed parent is Rangpur lime (Citrus × limonia 'Rangpur'). See Native Australian Citrus – wild species, cultivars and hybrids published by Primary Industries and Resources, Government of South Australia (PIRSA) FS No: 7/03. The parent tree of the Sunrise Lime was selected in1990 at CSIRO Plant Industry. Under the right conditions the tree produces striking, bloodred coloured fruit, which greatly enhances the appeal of the fresh and processed product. The variety also has potential as an ornamental tree. Fruit is produced on an attractive, dense, upright shrub to small tree, usually 2 to 3 m high and 2 m wide with dark, glossy-green foliage and red growth flushes. Fruits ripen in winter, are oval in shape and are usually 30 to 50 mm long, by 20 to 30 mm wide. The flesh and juice may show red tinges or may occasionally be more intensely red. Seeds are small and plump. The fruit is used in a variety of sweet and savoury dishes and it can be used in many value-added products such as marmalades, preserves, syrups, juices, beverages and sauces. The bottom picture shows Australian 'Blood', 'Outback' and 'Sunrise' limes.
ENG	Australian Blood lime, Australian Red Centre lime
FRA
Photos	The bottom picture shows Blood, Outback and Sunrise limes.	© CSIRO Plant Industry


LAT	Citrus australis (Sweet) Planchon
Syn	Microcitrus australis (Planchon) Swingle Limonia australis G. Don
	Australian round lime, Citrus australis (previously Microcitrus australis) , is a shrub or tall narrow tree occurring on the open and drier rainforest margins of southeast Queensland, from Brisbane northwards. It produces round fruit with a thick, green to lemon-coloured skin and pale green pulp, very similar to a small commercial lime in appearance. This species, called "Dooja" by the aborigines and round lime or native orange by other Australians, is readily distinguished from all the other species of Microcitrus (and from Eremocitrus as well) by its globose or slightly pear-shaped, rough-skinned fruits, 2.5 to 5 cm in diameter (about the size of a large walnut), and by its short-stalked pulp-vesicles that taper gradually into blunt tips often more or less deformed and twisted by mutual pressure. These pulp-vesicles are very different in shape from those of the finger-lime, M. australasica, or those of the other species of Microcitrus. They are similar to those of the commonly cultivated citrus fruits except that they contain, along their central axis, large masses of yellowish oil. The Australian round lime grows to be a tree 10 - 20 metres (30 to 60 feet) high and is the largest of any of the native citrus fruit trees. The fruit is used for preserves in Queensland.
ENG	Australian round lime, Round lime, Dooja, Gympie lime
FRA	Lime ronde d'Australie
Photos		(1) © UC-Riverside Citrus Variety Collection (2) © Home Citrus Growers (3) © Saga Univ. Dept of Agriculture


LAT	Citrus × virgata Mabb.
Syn	Microcitrus × virgata H. Hume Rofaustrime Tanaka Citrus australasica F. Muell. × Citrus australis Planchon
	Sydney hybrid, a cross between Australian finger lime (Citrus australasica) and Australian round lime (Citrus australis), was provisionally given the scientific name of Microcitrus virgata by H. Hume before its hybrid nature was established. Recently D.J. Mabberley has classified it as Citrus × virgata. It is notable for its extreme vigour, exceeding that of all other known citrus in the length of twigs produced. The leaves are intermediate in shape between the two parent species, but, owing to the enormous number of twigs and consequent great profusion of leaves, they are not intermediate in size between those of the parent species, but nearer that of the small-leaved parent, the finger lime. The fruits are elongate-obovoid or ellipsoid, 35-50 X 20-28 mm, with the tip abruptly rounded.
ENG	Sydney hybrid wild lime, Lemon-shaped Australian wild lime
FRA	Lime sauvage hybride de Sydney
Photos		(1) © Jorma Koskinen (2-3) © Gene Lester


LAT	Citrus garrawayae F.M. Bailey
Syn	Microcitrus garrawayae (F.M.Bailey) Swingle
	Mount White lime, Citrus garrawayae (previously Microcitrus garrawayae), occurs in rainforests on Cape York Peninsula. It produces a finger-shaped fruit, similar to Finger lime, Citrus australasica, though shorter and thicker, with a pale lemon skin and light green pulp. Due to its limited distribution this species is considered rare in the wild and fruit is not traded commercially. Mount White lime is endemic to the foothills and upland rainforest of the Cook District on Cape York Peninsula. It grows in deciduous vine thickets as an understorey shrub and has been recorded at a height of 15 m. Mount White Lime is similar to Finger lime, but has broader leaves. Fruit forms from April to November. The fruits are also “finger-shaped”, with a green skin and greenish-white pulp on maturity. The fruit can be used for value-added products.
ENG	Mount White lime, Garraway's Australian wild lime
FRA
Photos		Photos by Murray Fagg © Australian National Botanic Gardens


LAT	Citrus inodora F.M. Bailey
Syn	Microcitrus inodora (F.M.Bailey) Swingle
	Russel River lime or Large-leaf Australian wild lime, Citrus inodora (previously Microcitrus inodora), is now rare in the wild. It is native to the high-rainfall lowland rainforest at the foot of the Bellenden-Ker Range between Cairns and Innisfail in northern Queensland, much of which has now been cleared to grow sugar cane or bananas. It is a shrub or small tree 2 to 4 meters high with the trunk 4 to 5 cm in diameter and produces a lemon-shaped fruit. Fruit is not traded commercially. The twigs are angular like those of Citrus sinensis (the sweet orange) and have one or two slender, very sharp spines, 6 to 12 mm long. Leaves are the biggest in the Microcitrus group. As the botanical name suggests there is very little oil both in the leaves and flowers and consequently no odour. The bottom picture is of a fruit 6 mm x 12 mm in size, which Mike Saalfeld managed to grow in the UK. See Home Citrus Growers.
	An inodora seedling. Although Australian citrus usually grow true from seed it is not unusual to get hybrids in mixed plantations. In the bottom picture is an inodora plant grown by Gene Lester from seeds he received. The plant itself does not have the typical diamond-shaped leaves even in maturity (10 ft tall) but it does have paired spines, a distinguishing feature of the Russel River lime. Click bottom photo to enlarge.
ENG	Russel River lime, Large-leaf Australian wild lime, North Queensland lime
FRA
Photos		© Saga Univ. Dept of Agriculture (2) © Murray Fagg (3) © Home Citrus Growers (4) © Jorma Koskinen
	(photo 2) Australian National Botanic Gardens


LAT	Citrus inodora F.M. Bailey var. maideniana	If you would like to share a picture, please contact Citrus Pages
Syn	Microcitrus maideniana (Domin.) Swingle
	Commonly known as Maiden’s Australian lime, Swingle's Microcitrus maideniana is often described as a variety or subspecies of the Russel River lime. The two species have a similar distribution, limited to a small area in far North Queensland. The deeply depressed apex of the fruit is the only clearly distinctive character known. Fruit is not commercially traded. Some botanists today consider Russel River lime and Maiden's Australian wild lime to be one and the same species and the name Citrus inodora valid for both.
ENG	Maiden's Australian wild lime


LAT	Citrus gracilis Mabb.
Syn
	Kakadu lime, Citrus gracilis has recently been described and classified by D.J. Mabberley and grows wild as a straggling tree in eucalypt woodland in the Northern Territory. It has a similar growth habit to Citrus glauca and produces round fruit up to 8cm in diameter.Fruit is not traded commercially. Northern Territory Herbarium lists this as near threatened and endemic to NT. The specific epithet (gracilis) refers to the graceful aspect of the flowering twigs. Superficially resembling Citrus wintersii Mabb. in its narrow leaves, it differs from that New Guinea endemic in not having cylindrical fruits. From the other New Guinea endemic, Microcitrus warburgiana, with which some forms share the broader leaves characteristic of many specimens of that species, it differs in its much larger fruit as it also does from Eremocitrus glauca, which also has narrow leaves and suckering spiny shoots. The pictures were taken by Garry Riggs from Australia. He wrote: "The photo was taken of a tree near Lake Duggan a protected conservation area of 300 hectares on our cattle property west of Mataranka NT. I have never noticed the tree until it started bearing fruit. Then we got interested in identifying the tree. We now have identified a number of Citrus gracilis in the area." For a detailed description see: D.J. Mabberley, Australian Citreae http://www.rbgsyd.nsw.gov.au/__data/assets/pdf_file/0003/73236/Tel7Mab333.pdf
ENG	Kakadu lime, Humpty Doo lime
FRA
Photos		© Garry Riggs


LAT	Citrus glauca (Lindlay) Burkill
Syn	Eremocitrus glauca (Lindlay) Swingle
	Australian desert lime is originally from southeastern Queensland. It is able to withstand long periods of severe drought and strong, hot winds. The tree will defoliate, leaving its thin, weeping green branches resembling a smoke tree. It can endure high concentrations of salts in the soil and can grow up to over 7 metres (25 ft) with access to water. Eremocitrus leaves are linear in shape and fruits are green, about the size of a marble, and taste much like a regular lime. It has the shortest flowering to fruit maturity period (about 8 weeks) of any member of the citrus family. Australian desert lime grows wild in Queensland and New South Wales with some isolated occurrences in central South Australia. It is the only known member of the citrus family which is a xerophyte: it is able to withstand severe drought and hot dry winds. Under such conditions the leaves fall off and the leafless gray-green twigs carry on photosynthesis on a reduced scale. The plant tolerates high temperatures (up to 45°C) and when dormant in late winter is able to withstand temperatures below freezing point without injury. Seedlings develop an enormous root system before making vigorous aerial growth and developing full-sized leaves. A new species, Citrus gracilis, has recently been described and grows wild as a straggling tree in Eucalypt woodland in the Northern Territory. It has a similar growth habit to Eremocitrus glauca and produces round fruit up to 8cm in diameter.
ENG	Australian desert lime, Limebush
FRA	Lime du désert australien
Photos		(1-2) © Jorma Koskinen (3-4) © Petr Broža


LAT	Citrus glauca 'Outback Lime'
Syn	Eremocitrus glauca 'Outback Lime'
	The Australian Outback Lime (also known as ‘Australian Desert’) is a variety of desert lime (Citrus glauca). It is a cultivar selected and developed from a collection of different native desert lime trees, producing small, green, juicy fruits which ripen at Christmas time. The variety was selected in 1990 at CSIRO Plant Industry. It has been grown commercially since 2001 and was so successful it was made available for home gardeners in 2005. Under commercial cultivation it is an open, upright shrub to small tree, usually 2 to 4 m high and 1.5 to 2 m wide. Small, white flowers occur in spring. The crop is carried on the previous season’s growth, towards the outside of the canopy. The flowering to harvest time is extremely short, in the order of 2 to 3 months. The spherical fruits (to 20 mm) have a thin skin and turn from green to yellow as they ripen in early summer. The fruits can be used for preparing sauces.
ENG	Australian Outback lime
FRA
Photos		© CSIRO Plant Industry


LAT	Eremolemon
Syn	Citrus glauca × Citrus meyerii
	Eremolemon is believed to be a spontaneous Australian desert lime × Meyer lemon cross that occurred in the Coachella Valley at the U.S. Date & Citrus Station. The leaves are dark green and lanceolate. The fruit is subglobose, yellow and about 20 mm in diameter. It has five or six segments and usually one to three seeds. The seeds seem to be polyembryonic and grow true to type. The trees seem to grow larger than a regular Australian desert lime Citrus glauca but are reported to have the same tolerance for saline soils. Seedlings grow rapidly and have deep taproots. Due to the place of origin the variety is sometimes also called Coachella Eremolemon.
ENG	Eremolemon
FRA
Photos		© Gene Lester


LAT	Citrus wintersii Mabb.
Syn	Microcitrus papuana Winters
	The new classification of the Brown River finger lime given by D.J. Mabberley, Citrus wintersii, commemorates Harold F. Winters of the USDA, Beltsville, who first described the plant as recently as 1970. Finding information on the two native citrus species not of Australian origin, the Brown River finger lime, Citrus wintersii (previously Microcitus papuana) and New Guinea wild lime Citrus warburgiana (previously Microcitrus warburgiana) is very difficult. Information on the Brown River finger lime from Papua New Guinea is very scarce indeed. "The plant is a bush that can reach 3 m. The leaves are narrow and about 2-3 cm long. The fusiform fruit has a lenth of 3 to 6 cm. Its color stays green when ripe. Local people say they never become yellow. The vesicules are round, 'caviar' type. The pulp tastes limony." Sylvain Jousse 2014.
	Text on the original herbarium holotype specimen at the Herbarium of the U.S. National Arboretum dated 26 March 1970 of the new variety Microcitrus papuana says: Shrub to 1.5 m; leaves tiny; slender; spiny twigs; fruit 1.3 cm × 6.35 cm; yellow at maturity. Wild.
	A secondary paratype shows larger twigs. Both herbarium specimens of Citrus wintersii published with permission of the US National Arboretum, USDA-ARS, Washington, DC.
ENG	Brown River finger lime, Papuan wild lime
FRA	Lime digité de Brown River
Photos		© Sylvain Jousse


LAT	Citrus warburgiana F.M. Bailey
Syn	Microcitrus warburgiana (F.M. Bailey) Tanaka
	New Guinea wild lime is the other Microcitrus species not native to Australia. The tree has an upright growth habit and grows very slowly. The leaves are long and dark green. The small flowers are white. The fruits are small, about 3 cm in diametre, globose, with three to six segments and 5-7 seeds. The skin colour is dark green. The petioles differ from those of the other species of Microcitrus in having a very narrowly crenulate margin or wing. The veins are numerous, making only a small angle (35° to 50°) with the midrib, and soon branch, forming a reticulation of veinlets not unlike those of M. garrawayae, although the latter species has smaller leaves with fewer veins. The ultimate twigs, especially the short lateral branchlets, are remarkably slender, the smallest lateral twigs being 1 to 1.5 mm or even only 0.5 to 0.8 mm in diameter.
ENG	New Guinea wild lime
FRA	Lime sauvage de Nouvelle-Guinée
Photos		(1) © UC-Riverside Citrus Collection (2,3) © Saga Univ. Dept of Agriculture