Keys in Flora of Bhutan:
I. Procumbent creeping herb with ascending branches 3. L. lysimachioides
+ Small shrub . . . . . . .. 2
2. Calyx teeth 5-7, linear-triangular, c 2mm . . . . . .. 1. L. crassipetalum
+ Calyx teeth 10, subulate. 3.5-6mm (if teeth 10 and only 1.5-2mm, cf. L. biflora) . . .. 2. L. macrodon .
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Keys available in Flora of China .
Lycianthes biflora (Loureiro) Bitter (China (Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hunan, Jiangxi, S-Sichuan, Yunnan), Taiwan, India, Indonesia, Japan (Honshu, Shikoku, Kyushu), Ryukyu Isl., New Guinea, Philippines (Batanes, Luzon, Catanduanes, Mindanao), Palawan, Java, Christmas Isl. (Australia), peninsular Malaysia (Kelantan, Pahang, Selangor), Andamans (South Andamans), Myanmar [Burma] (Taninthayi), Nepal, Laos as per Catalogue of Life) Lycianthes crassipetala (Wall.) R.R.Mill (Nepal, Bhutan, Darjeeling, Sikkim, India as per Catalogue of Life)
Lycianthes laevis (Dunal) Bitter (China (Guangxi, Hainan, Yunnan), Indonesia, Java, India, peninsular Malaysia, Laos as per Catalogue of Life)
Lycianthes lysimachioides (Wall.) Bitter (China (Fujian, Guangdong, Guangxi, Guizhou, Hubei, Hunan, Jiangxi, Sichuan, Yunnan), Taiwan, India, Java, Indonesia, Nepal, Darjeeling, Sikkim, Vietnam as per Catalogue of Life)
Lycianthes macrodon (Wall. ex Nees) Bitter (China (Yunnan), Vietnam, Taiwan, Bangladesh, Bhutan, India, Nepal, Thailand, Darjeeling, Sikkim as per Catalogue of Life)
Lycianthes neesiana (Wall. ex Nees) D’ Arcy & Z.Y.Zhang (China (Fujian, Guangdong, Guangxi, Hunan, Yunnan), India, Indonesia, Thailand as per Catalogue of Life) .
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