4. Oxytropis trichocalycina Bunge ex Boissier, Fl. Orient. 2: 502. 1872.
毛齿棘豆 mao chi ji dou
Herbs, 3-12 cm tall, acaulescent, from a short multiheaded caudex. Stipules subulate to linear-lanceolate with a subulate linear free part, lanate with white soft trichomes, adnate to petioles nearly to middle, not connate. Leaves 1.5-5 cm, 11-15-foliolate; petiole and rachis with spreading dense cottonlike trichomes; leaflet blades linear-lanceolate, 3-11 mm, both surfaces densely sericeous-lanate. Racemes compact, many flowered; peduncle longer than leaves, densely and softly shortly lanate-pubescent mixed with sparse long trichomes; bracts linear-subulate, 5-10 mm, with soft lanate pubescence. Calyx campanulate, not inflated, 0.9-1.5 cm, densely lanate with spreading soft trichomes; lobes subulate, ca. 2 × as long as tube, densely plumose. Corolla purple; standard 1-1.4 cm, lamina oblong-ovate, apex rounded to retuse; wings slightly shorter than standard; keel subequal to wings, beak long subulate, 2.5-3 mm. Legume sessile, oblong-ovoid, 7-9 × 2.5-3 mm, inflated, thinly leathery, included in calyx, 1-locular, 2-seeded, with appressed white short trichomes, beak ca. 2 mm. Fl. May-Jun, fr. May-Jun.
S-facing slopes, in gravelly areas. Xinjiang [Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, Uzbekistan].