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Keys in Flora of Bhutan are as below:

1. Leaves pinnate .. 3. M. pinnata
+ Leaves simple … 2
2. Evergreen; leaves entire or serrate with rather broad teeth, veins curving towards apex near margin ….. 1. M. simplicifolia
+ Deciduous; leaves serrate with fine teeth, veins running +/- straight to margin and most excurrent into fine teeth …. 2.
M. dilleniifolia


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Meliosma dilleniifolia (Wall. ex Wight & Arn.) Walp. (Bhutan, India (Darjeeling, Himachal Pradesh, Arunachal Pradesh), Sikkim, SE-Tibet, N-Burma, Nepal as per Catalogue of life)
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Meliosma pinnata (Roxb.) Maxim. subsp. barbulata (Cufod.) Beusekom, M. D. Dassanayake & F. R. Fosberg (China (Fujian, N-Guangdong, NE-Guangxi, E-Guizhou, Hunan, E-Jiangxi, SW-Zhejiang), Thailand, Laos, India (West Bengal, Assam, Nagaland, Manipur, Mizoram, Meghalaya, Karnataka, Tamil Nadu, Kerala), Sikkim, Myanmar [Burma] as per Catalogue of life)
(Images by N Muthu Karthick (Id by Giby Kuriakose & C. Kunhikannan) (Inserted by J.M.Garg) (For more photos & complete details, click on the links))

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Meliosma simplicifolia subsp. simplicifolia (SE-Tibet, China (W-Yunnan), Sri Lanka, Thailand, Vietnam, Sumatra, +Java, India (Uttar Pradesh, Bihar, West Bengal, Arunachal Pradesh, Assam, Nagaland, Manipur, Tripura, Meghalaya, Orissa, Andhra Pradesh, Karnataka, Tamil Nadu, Kerala), Sikkim, Bangladesh, Bhutan, Laos, Nepal, Myanmar [Burma] (Chin, Kachin, Taninthayi), Pakistan (Hazara, Rawalpindi), Jammu & Kashmir (Poonch, Kashmir) as per Catalogue of Life)

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Meliosma simplicifolia subsp. pungens (Walp.) van Beusekom (Sri Lanka, N-Sumatra, India (Karnataka, Tamil Nadu, Sri Lanka) as per Catalogue of Life)
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(Images by P. Santhan (Inserted by J.M.Garg) (For more photos & complete details, click on the links))

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Meliosma yunnanensis Franch. (Himalaya to S. Central China and N. Myanmar: Assam, China South-Central, East Himalaya, Myanmar, Nepal, Tibet, West Himalaya as per POWO)
   


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Flora of Peninsular India with keys at species links (Distribution as per Catalogue of Life):

Meliosma pinnata subsp. arnottiana syn. of Meliosma arnottiana (Wight) Walp. (peninsular Malaysia (Tapah Hills, Perak, and Cameron Highlands, Pahan), Myanmar
[Burma], Sri Lanka, Indochina, Sumatra, Java, Taiwan, Nepal, Laos, Vietnam,
Philippines (Batan, Luzon, Mindanao), Myanmar [Burma] (Kachin, Sagaing), China
(S-Guangxi, S-Yunnan))
Meliosma pinnata subsp. barbulata (syn. Meliosma rhoifolia var. barbulata (Cufod.) Y.W.Law – China (Fujian, N-Guangdong, NE-Guangxi, E-Guizhou, Hunan, E-Jiangxi,
SW-Zhejiang), Thailand, Laos, India (West Bengal, Assam, Nagaland, Manipur,
Mizoram, Meghalaya, Karnataka, Tamil Nadu, Kerala), Sikkim, Myanmar [Burma])
Meliosma pinnata subsp. pinnata (A.P., Odisha) (S-Tibet, India (Darjeeling, West Bengal, Arunachal Pradesh, Assam, Nagaland,
Manipur, Mizoram, Meghalaya, Andhra Pradesh), Sikkim, Bhutan, Bangladesh,
Myanmar [Burma] (Kachin, Sagaing), Nepal)
Meliosma simplicifolia subsp. pungens (Sri Lanka, N-Sumatra, India (Karnataka, Tamil Nadu, Sri Lanka))
Meliosma simplicifolia subsp. simplicifolia (SE-Tibet, China (W-Yunnan), Sri Lanka, Thailand, Vietnam, Sumatra, +Java, India (Uttar Pradesh, Bihar, West Bengal, Arunachal Pradesh, Assam, Nagaland, Manipur, Tripura, Meghalaya, Orissa, Andhra Pradesh, Karnataka, Tamil Nadu, Kerala), Sikkim, Bangladesh, Bhutan, Laos, Nepal, Myanmar [Burma] (Chin, Kachin, Taninthayi), Pakistan (Hazara, Rawalpindi), Jammu & Kashmir (Poonch, Kashmir))

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Species with description & keys from Flora of Pakistan (Distribution):
Meliosma simplicifolia (Roxb.) Walp. (N.W. Pakistan, India, Nepal, Tibet, Burma, China, Malaya and Indo-China)

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Meliosma dilleniifolia (Wall. ex Wight & Arn.) Walp. (1800-2900 m; Himalaya (Punjab to Bhutan), Tibet, N. Burma)
Meliosma pinnata (Roxb.) Maxim. (300-400 m; Himalaya (Kumaun to Bhutan), N. India)
Meliosma simplicifolia subsp. simplicifolia (Roxb.) Walp. (200-2500 m; Himalaya (Kumaun to Bhutan), Assam, Burma, Ceylon, Thailand, Indo-China, W. China, Sumatra)
Meliosma simplicifolia subsp. thomsonii (Roxb.) Walp. (Himalaya (Punjab to Bhutan), Assam, Burma, Indo-China, S. W. China) (syn. of Meliosma thomsonii King ex Brandis)
Meliosma simplicifolia subsp. yunnanensis (Roxb.) Walp. (1800-2400 m; Himalaya (Kumaun to Bhutan), Assam, S.E. Tibet, Burma, N. & N. W. China) (syn. of Meliosma yunnanensis Franch.)

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Meliosma arnottiana (Wight) Walpers  [India, Indonesia, Japan, S Korea, Malaysia, Nepal, Philippines, Sri Lanka, Thailand, Vietnam].
Meliosma henryi Diels [India]- No distribution in India as per Catalogue of life;
Meliosma pinnata (Roxburgh) Maximowicz [Bangladesh, Bhutan, NE India, N Myanmar]. 
Meliosma rhoifolia var. barbulata (Cufodontis) Y. W. Law (syn. of Meliosma pinnata subsp. barbulata (Cufod.) Beusekom ex Welzen-  China (Fujian, N-Guangdong, NE-Guangxi, E-Guizhou, Hunan, E-Jiangxi,
SW-Zhejiang), Thailand, Laos, India (West Bengal, Assam, Nagaland, Manipur,
Mizoram, Meghalaya, Karnataka, Tamil Nadu, Kerala), Sikkim, Myanmar [Burma])
Meliosma simplicifolia (Roxburgh) Walpers [Bangladesh, Bhutan, India, N Laos, Myanmar, Nepal, Sri Lanka, Thailand].
Meliosma thomsonii King ex Brandis  [N India, N Myanmar, Nepal].
Meliosma thorelii Lecomte [India, Laos, Vietnam]- No distribution in India as per Catalogue of life;
Meliosma yunnanensis Franchet [Bhutan, N India, N Myanmar, Nepal].

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Pl. go through Meliosma (‎‎‎‎‎‎Sabiaceae) page with images of species (done by me) in efloraofindia.

If you find any mis-identification, pl. let us know. If anybody can send images of other species of this genera (for incorporation in the website), if any, it will be really nice.
Also, if anybody is interested to take up the activity of inserting images on efloraofindia pages from efloraofindia posts, pl. let us know.