球茎石豆兰 qiu jing shi dou lan

Phyllorkis tristis (H. G. Reichenbach) Kuntze.

Rhizome stout, 2-3 mm in diam. Pseudobulbs ca. 5 mm apart on rhizome, subglobose, broader than long, 13-20 mm in diam., apex with 2 leaves. Leaf deciduous at anthesis, subsessile; blade pale green, ± lanceolate, ca. 10 × 2 cm, apex acute. Scape arising from base of leafless pseudobulb, 2-4 cm; raceme sometimes nodding, 1-1.5 cm, densely many flowered; peduncle ca. 1 mm in diam., with 2 or 3 sheaths 5-6 mm; floral bracts 2-3 mm, apex acute. Pedicel and ovary ca. 2 mm. Flowers pale purplish red, marked with purple spots. Dorsal sepal ovate, concave, ca. 4 × 2.2 mm, glabrous, entire, acute; lateral sepals adnate to column foot, ovate, ca. 5 × 2.2 mm, glabrous, their lower edges connate to each other, entire, acute. Petals triangular, ca. 2.2 × 1.2 mm, base ca. 1/2 width adnate to column foot, margin entire, apex acute; lip ligulate, ca. 3.2 mm, ± fleshy, base grooved, attached to end of column foot by an immobile joint, margin decurved. Column ca. 2 mm; foot ca. 1.5 mm, with free part ca. 1 mm; stelidia narrowly lanceolate, ca. 0.6 mm; anther cap slightly and minutely papillate. Fl. Jan-Feb. 2n = 38.

Tree trunks in forests; 800-1800 m. S Yunnan [India, Myanmar, Nepal, Thailand].