Citrus glauca
Citrus glauca, commonly known as the desert lime, is a thorny shrub or small tree native to Queensland, New South Wales, and South Australia. Taxonomy. Under the Swingle system, the desert lime was classified in the genus "Eremocitrus", a close relative of the genus "Citrus". More recent taxonomy considers all the Australian limes to be included in the genus "Citrus", and most authorities treat the desert lime this way. "Citrus glauca" is one of the most resilient "Citrus" species, and is comparatively heat, drought, and cold tolerant. Hence the species is potentially important for "Citrus" breeding programs, and  readily hybridises with many common "Citrus" species. Description. A shrub or small tree to , it has several unusual characteristics. It is cold, heat, drought and salinity tolerant and thought evergreen. If the rains should fail it will shed its leaves and live off the green bark on the plant branches. It will set fruit almost immediately after flowering and is the earliest citrus to do so. Fruit is small and variable and depends on current climatic conditions and genetic make-up. Thorns appear on low-growing branches to prevent grazing by rabbits, kangaroos, cattle etc. but cease on branches above  the grazing level. The limes are small with an intense piquant flavour, and good rainfall years produce an abundance of fruit. Economic uses. The desert lime fruit is a highly prized bushfood. Traditionally, it is wild-harvested from surviving bushland areas, where it is relatively common. However, "C. glauca" has also been extensively cleared from some areas due to the ongoing conversion of the wild bush into agricultural fields. The fruit are used in a range of products, including marmalades, beverages, and succade. It has a strong lime-like flavour. The fruit is beginning to be domesticated. Commercial cultivation of  this fruit is beginning to reduce the reliance on wild-harvested product. Taxonomy, cultivars, and hybrids. Australian outback lime. The Australian Outback lime was selected by CSIRO scientists from the regular desert lime. It is characterised by its upright habit, relatively large, flavoursome fruit, high yield, uniform ripening time, lack of thorns, and suitability for mechanical harvesting. The Australian Outback lime was cultivated at the former CSIRO Plant Industry site at Merbein, Victoria by Steve Sykes. Hybrids. The eremolemon is thought to be a "Citrus glauca" × "Citrus meyeri" hybrid. It grows quickly and tolerates saline soil. "Citrus" plants hybridise  readily. The eremolemon is thought to be a natural true-breeding cross between the desert lime and the Meyer lemon. Other hybrids include eremoranges, eremoradias (hybrid with a sour orange) and citrangeremos (hybrid with a citrange).