J. Jpn. Bot. 92(4): 193–198 (2017)

Vigna sathishiana (): A New Species from Southern Western Ghats,

a, b Anoop Puthuparampil Balan *, Sreevilas Vasudevan Predeep c and Punnakkal Sreedharan Udayan

aIndian Cardamom Research Institute, Myladumpara, Idukki, Kerala, INDIA; bP.G. Department of Botany, Sree Vidyadhi Raja Nair Service Society College, Vazhoor, Kottayam, Kerala, INDIA; cP.G. Department of Botany, Sree Krishna College, Guruvayur, Thrissur, Kerala, INDIA *Corresponding author: [email protected]

(Accepted on February 24, 2017)

Vigna sathishiana A. P. Balan & S. V. Predeep, a new species of the genus Vigna Savi of the sect. Ceratotropis (Fabaceae) is described and illustrated from the southern Western Ghats of India. The diagnostic morphological characters, detailed description, illustration and images are presented with notes on habitat, ecology and conservation status.

Key words: Fabaceae, India, new species, Vigna, Western Ghats.

Vigna Savi (Fabaceae) is a large pantropical elevated to the rank of species and named Vigna genus with 104 species (Lewis et al. 2005) in indica (Dixit et al. 2011). Similarly, Aitawade et seven subgenera viz. Ceratotropis, Haydonia, al. (2012) elevated Vigna mungo var. sylvestris Lasiospron, Macrorhynchus, Plectotropis, Lukoki, Marechal & Octoual to the rank of Sigmoidotropis and Vigna (Marechal et al. species. They also added a new species to the 1978). The subgenus Ceratotropis (Piper) genus, Vigna sahyadriana Aitawade, K. V. Bhat Verdc., also known as Asian Vigna, has its centre & S. R. Yadav from the northern Western Ghats. of diversity in Asia with 21 species (Tomooka et Vigna yadavii Gaikwad, Gore, Randive & Garad al. 2002). The genus has commercial potential (Gaikwad et al. 2014) and Vigna pandeyana as sources of pulses and forage crops and has Gore, S. P. Gaikwad & Randive (Gaikwad et al. a complex because of its complex 2015) are two other species recently discovered floral characters and close relationship with the from northern Western Ghats. Latha et al. (2014) genus Phaseolus L. Floral characteristics like described a new species, Vigna konkanensis size of keel pocket, twisting of beak, nature Latha, K. V. Bhat, I. S. Bisht, Scariah, Joseph of style and stigma, nature of pod trichomes, John & Krishnaraj, from the west coast of India. number, size, shape and surface nature of seeds, While exploring the legume flora of Western etc. are significant characters in determination of Ghats, the first author collected some interesting the species. Babu et al. (1987) revised the tribe Vigna specimens from the Kallar dam site of Phaseoleae for India and recognized 23 species Idukki district in Kerala state. Critical study of Vigna in the country. Recently, Vigna trilobata with the literature (Baker 1876, Gamble 1918, (L.) Verdc. var. pusilla Naik & Pokle was Verdcourt 1970, Marechal et al. 1978, Babu et al.

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de donnees morphologiques et polliniques traitees par Publishers, London. l’anyse informatique. Biossiera 28: 1–273. Verdcourt B. 1970. Studies in the Leguminosae- Tomooka N., Vaughan D. A., Moss H. and Maxted N. Papilionoideae for the ‘Flora of Tropical East Africa’: 2002. The Asian Vigna: Genus Vigna subgenus IV. Kew Bull. 24(3): 507–569. Ceratotropis genetic resources. Kluwer Academic

a b c A. P. Balan , S. V. Predeep , P. S. Udayan ：インド・西ガ ーツ山脈南部からの 1 新種，Vigna sathishiana（マメ科） マ メ 科 サ サ ゲ 属 Ceratotropis 節 の 1 新 種，Vigna 花をつけ，花と果実が小型で，種皮に細かく隆起した皺 sathishiana A. P. Balan & S. V. Predeep をインド・西ガ のある褐色の種子をもつこと，また花粉粒が小型で外壁 ーツ山脈南部から記載した．本種はケララ州 Idukki の模様が異なる． 地 方 か ら 得 ら れ た も の で，V. radiata (L.) Wilczek や （aインド・Indian Cardamom Research Institute, V. sublobata (Roxb.) Bairiganjan, Panda, Choudhury & bインド・Sree Vidyadhi Raja Nair Service Society College, Patnaik に近いが，全体小型でつる性となり，小葉は全 Department of Botany, 縁で鈍頭〜鋭頭でまばらに毛があり，総状花序は 2–3 cインド・Sree Krishna College, Department of Botany）