94. Corydalis longicornu Franchet, Bull. Soc. Bot. France. 33: 394. 1886.
开阳黄堇 kai yang huang jin
Corydalis clematis H. Léveillé.
Herbs, perennial, 40-80 cm tall. Roots several, not turning black upon drying, linear, stout. Stems diffuse to suberect, brown, branched from base. Basal leaves early withering. Cauline leaves many, weak, long petiolate; blade triternate, abaxially glaucous and finely papillose with papillose-scabrid veins, adaxially green or slightly glaucous; primary pinnae long petiolulate; secondary pinnules shortly petiolulate; ultimate leaflets subsessile, broadly elliptic to ovate, 1-3 × 0.5-2 cm, entire, subacute, mucronate. Racemes dense, 10-26-flowered, secund, shortly stalked; bracts linear-lanceolate, 2-5 mm, entire. Pedicel slender, 3-6 mm, slightly elongating and recurved in fruit. Sepals ca. 0.5 × 1 mm, deeply lacerate-dentate. Petals yellow; outer petals with narrow (ca. 0.5 mm) crest reaching apex, limb navicular, acute, not expanded; upper petal 17-20 mm; spur straight, 11-14 mm, slender, evenly tapering toward tip; nectary ca. 3/4 as long to as long as spur, thin; lower petal navicular-obovate with narrow base, 7-8 mm; inner petals 6-7 mm, claw ca. as long as limb. Capsule 7-12 × 1-1.5 mm, 4-8-seeded; style ca. 3 mm. Seeds round, ca. 1 mm, "minutissime punctulata" or smooth, with small elaiosome. Fl. and fr. May-Aug.
● Disturbed limestone scree, roadside slopes; 1700-3000 m. W Guizhou (Kaiyang, Panxian), NE Yunnan.
A specimen (Teng 90525) from Xifeng, C Guizhou, close to Kaiyang (type locality for Corydalis clematis), deviates by biternate leaves with very large leaflets (to 4 cm), short and broad fruit (ca. 6 × 2.5 mm), and smooth seeds, and may represent a separate taxon.