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Astragalus arnoldii is close relative of Astragalus dshangartensis, but differs from the latter in its stipules 3-5 mm (vs. 1.5-2 mm), white hairy (vs. white and black hairy), standard 6-8 mm (ca. 10 mm), peduncles 1-2.5 cm (vs. 4-9 cm), legumes inflated (vs. ca. 1.5 mm high and ca. 1 mm wide), nearly 1-locular (vs. 2-locular).
Astragalus arnoldii is occurring in Qinghai, Xinjiang, Xizang of China, india, Sikkim, Kashmir, Nepal.
Plants 3-5 cm tall, nearly acaulescent, forming compact mats; hairs appressed, in vegetative parts white, 0.5-1 mm long. Leaves 1-2 cm long; stipules 3-5 mm, adnate to petiole up to 1/2, shortly connate behind stem, loosely to densely white hairy; petiole 0.8-1.5 cm, like slender rachis rather densely hairy; leaflets in 1-3 pairs, 1-5 mm long, 0.5-1 mm wide, often folded, both surfaces rather densely hairy. Racemes rather densely 4-8-flowered, somewhat elongated in fruit; peduncle 1-2.5 cm, slender, rather densely hairy; bracts 1.5-2 mm, with few black hairs. Calyx 3-4 mm, loosely to rather densely predominantly black hairy; teeth 0.5-1 mm. Petals purplish to violet; standard nearly orbicular, 6-8 mm long, 4-5 mm wide, apex emarginate; wings 6-7.5 mm long; keel 5.5-6.5 mm long. Legumes sessile, slightly curved, 8-10 mm, strongly inflated, with a slender beak 1-1.5 mm, nearly 1-locular; valves villous with white hairs.
Growing in alpine slopes; 4000-5500 m.
