Citrus halimii is quite rare and poorly studied. After its initial 1973 discovery and description, it has only been observed in a handful of locations scattered across Southeast Asia: Thailand and Malaysia (the locations of the first discoveries), along with isolated stands in Indonesia.
Citrus halimii is a midsized evergreen tree, with a mature height of 20 to 25 feet; it is somewhat less thorny than other citrus. Like other members of the papeda sub-group, the halimii has relatively large leaves, with a long, winged petiole.
The fruits of C. halimii are edible, but sour. They are round and small, measuring about 5–7 cm in diameter. The rather thick rind eventually ripens to yellow or orange-yellow; internally the rind is tightly bound to the flesh. The yellow-green segments are filled with a number of large seeds, and a small quantity of juice.
- The binomial was originally published at: Stone, B.C.; Lowry, J.B.; Scora, R.W.; Jong, K. (1973). "Citrus halimii : A new Species from Malaya and Peninsular Thailand". Biotropica 5 (2): 102–110.
- "Citrus halimii". Plant of the month. Bangkok, Thailand: Office of the Forest Herbarium : Department of National Parks, Wildlife and Plant Conservation. February, 2005. Retrieved November 24, 2009.
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