224. Corydalis homopetala Diels, Notes Roy. Bot. Gard. Edinburgh. 5: 255. 1912.
同瓣黄堇 tong ban huang jin
Herbs, perennial, 20-30 cm tall, glabrous; stems attenuate to filiform underground base. Roots and radical leaves unknown. Stems ascending, flexuous, slender, with 2 alternate leaves, and often a very small leaf close to inflorescence, simple or usually with late branches. Petiole of lower leaf 2-4 cm, upper petioles 0.5-1.5 cm; blade glaucous abaxially, triangular, 4-5 × 4-5 cm, twice to almost 3 × ternate; pinnae long petiolulate; pinnules shortly petiolulate, deeply 3-lobed; ultimate segments obovate or oblanceolate, 5-10 mm, apex rounded, mucronate. Main racemes 3-4 cm, 5-7-flowered, lax, elongating in fruit, usually with a few-flowered lateral raceme from uppermost leaf; bracts 2-7 mm, lower bracts pinnatifid, upper bracts oblanceolate, entire. Pedicel 3-7 mm at anthesis, reflexed in fruit and much elongating to 10-17 mm. Sepals unknown (or crescent-shaped, ca. 5 mm, margin with irregularly incised teeth). Corolla yellow, with darker veins, turning dull purple with age, darker toward tip, fragrant; outer petals navicular-ovate, apex subacute, not crested; upper petal 14-16 mm; spur straight, slightly attenuate to obtuse apex, 7-8 mm; nectary 1/3-1/2 as long as spur; lower petal elliptic, 8-9 mm, acute, distal part often reflexed; inner petals 7-8 mm, claw nearly as long as limb. Stigma square; marginal papillae: 2 central distinct, lateral broad and indistinct; geminate papillae sublateral and on prominent basal lobes. Capsule narrowly obovoid, 12-14 × ca. 3 mm, 10-13-seeded; style ca. 3 mm. Fl. and fr. Jul.
● Open grassy situations at margins of canebrakes, along pastures; 3000-3300 m. NW Yunnan (E side of Diancang Shan).
This plant has not been collected since 1910.