中缅黄堇 zhong mian huang jin

Herbs, perennial, 40-100 cm, scandent. Rootstock small, with few slender roots. Stems sharply angular, sparingly leafy, branched. Leaves: petiole 6-12 cm; blade triangular, 6-15 cm, triternate; petioles and petiolules very slender. Leaflets long stalked, slightly glaucous abaxially, ovate, 10-17 × 5-10 mm, thin, entire, obtuse. Racemes lax, 10-20-flowered, zigzag; bracts narrowly oblanceolate or linear, 5-10 mm, reflexed. Pedicel 10-30 mm, extremely thin, sharply deflexed at base. Sepals yellow or red, ovate, ca. 2 × 1 mm, shallowly dentate. Corolla golden yellow; outer petals with rather broad acute to acuminate limbs, without crest; spur of upper petal straight or slightly sigmoidally curved, ca. 11 mm, slender; nectary rudimentary, 3-4 mm, very thin; lower petal ca. 9 mm, with broad short claw and rounded shortly acuminate limb; inner petals ca. 9 mm, dorsal crests rounded, very slightly overtopping apex. Stigma with shallow median sinus, 4 apical papillae, and near apex with a pair of lateral papillae in conjunction with a pair of geminate papillae, basal corners not prolonged, without papillae. Fruit unknown.

Marshy leaf mold by streams in shade of dwarf forests; ca. 3000 m. W Yunnan [Myanmar (Mpimaw Hills)].