Vigna nepalensis Tateishi & Maxted, Kew Bull.57: 629 (2002);
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Central & E. Himalaya: Central & E. Himalaya as per POWO;
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SK 3637 17 September 2022: 10 images- 8 very high res.
latest checklist for Vigna sp. for Nepal!
Pl. check
https://efloraofindia.com/2011/04/05/vigna/
Pl. check Vigna nepalensis as per
https://www.gene.affrc.go.jp/databases-plant_images_detail_en.php?plno=5420610037
Looks close but I am not so sure. Elevation difference is about 1250ft.
The link I have given states distribution as East Nepal, India (Sikkim, Darjeeling and Assam) (Tateishi, 1985).
Darjeeling is at around the posted elevation and may be Sikkim also.
https://www.gene.affrc.go.jp/
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References:
POWO Catalogue of Life Annotated checklist of Flowering plants of Nepal Genebank