马牙黄堇 ma ya huang jin

Corydalis delavayi Franchet var. euryphylla Fedde; ?C. delavayi var. stenophylla Fedde; ?C. mayae var. stenophylla (Fedde) C. Y. Wu.

Herbs, perennial, 15-40 cm tall, glabrous or papillose-pubescent; stems and petioles of radical leaves attenuate to filiform underground base. Storage roots several, fascicled, narrowly oblong, 1-3 cm × 1.5-2.5 mm, with slender stalk 1-8 cm, simple or sometimes branched. Stems 1 or 2, erect, slender, simple, with (1 or)2(or 3) leaves in upper 1/2. Radical leaves few; petiole 6-11 cm; blade 2-3 × 3-4 cm, sub-biternate; lobules narrowly to broadly lanceolate, closely spaced, acute. Cauline leaves shortly stalked; blade 1.5-4(-6) × 1.5-4(-6) cm, pinnate; pinnae 2 or 3 pairs, entire or deeply 2-cleft; ultimate lobes narrowly to broadly lanceolate, 1-2(-3) × 0.2-0.5(-1.2) cm, abaxially with 3(-5) parallel raised veins. Raceme 2-6(-10) cm, 4-10-flowered; bracts elliptic to narrowly lanceolate, 5-15 mm, entire, acute. Pedicel 5-15 mm, stout, recurved in fruit. Sepals to 0.5 mm, dentate. Petals yellow, veins distinct (rarely violet?); outer petals shortly acuminate, with obvious lateral rounded lobes; upper petal 14-19(-25?) mm; abaxial crest 1-2 mm wide, attenuate in both directions, sometimes narrowly decurrent on spur; spur straight or very slightly upcurved, 7-12(-15?) mm, attenuate, apex rounded; nectary ca. 1/2 as long as spur; lower petal 8-12 mm, shortly crested, gradually narrowed to base; inner petals (7-)8-10 mm; claw nearly as long as petal lobe; lower margin of limb with semicircular extension. Ovules in 1 row; style 4-5 mm; stigma square, slightly emarginate; median 2 apical papillae distinct, lateral marginal papillae confluent; geminate papillae submarginal and on basal lobes. Fruit not seen. Fl. Jun-Aug.

Grassy slopes, stony slopes, shrubs, grasslands; 3400-4300 m. SE Xizang (Mainkung), NW Yunnan (Dêqên, Gongshan, Weixi) [Myanmar].