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Wild Vigna [Vigna nepalensis Y. Tateishi & N. Maxted]

Explanations

Taxonomy
Vigna nepalensis belongs to the subgenus Ceratotropis in the genus Vigna. 2n=22
Distribution
East Nepal, India (Sikkim, Darjeeling and Assam) (Tateishi, 1985).
Characteristics
The morphology of V.nepalensis is similar to that of V.angularis var.nipponensis. According to Tateishi(1985), Main differences between two taxa are length of hilum, shape of bracteoles and pubescens of inflorescens-rhachis. Stipule of Vigna nepalensis is peltate, narrowly oblong or narrowly ovate, acute at the apex, 7.5-12.5mm long, 1.5-4.5mm wide.
Flowers golden yellow, 18-19mm in diameter. Rhachis 2-6cm long, glabrous. Bracteole lanceolate or narrowly triangular-ovate, acute at the apex, 4-6mm long, 1.5-1.8mm wide, a little longer than or almost equal to the caryx. Pods pendulous, linear, cylindrical, 6-9cm long, 4-4.5mm wide，straight, glabrous.
Seeds short cylindrical or ellipsoidal, greyish brown and variegated with black when matured, smooth, 3-4.5mm x 2-3.2mm x 1.8-2.6mm. Hilum linear or oblong, 1.1-1.8mm long, aril thin.Germination hypocotyl, primary leaf cordate with long petiole. (Tateishi 1985).
As genetic resources
The evaluation as a genetic resources, such as resistance against diseases and insects has not been carried out. There are no genebanks that have the accessions of V.nepalensis throughout the world.
Therfore, collection and evaluation of this species is considered to be very important.
References
Tateishi,Y. 1985. A revision of the Azuki bean group, the subgenus Ceratotropis of the genus Vigna (Leguminosae). Ph.D. Thesis, Tohoku University, Sendai, Japan.