70. Bulbophyllum helenae (Kuntze) J. J. Smith, Bull. Jard. Bot. Buitenzorg, sér. 2. 8: 24. 1912.
角萼卷瓣兰 jiao e juan ban lan
Phyllorkis helenae Kuntze, Revis. Gen. Pl. 2: 676. 1891.
Rhizome stout, 6-7 mm in diam. Pseudobulbs 3-6 cm apart from each other, narrowly ovoid, 3-6 cm, 1.1-1.5 cm in diam., with a terminal leaf. Petiole 5-6 cm, conduplicate; leaf blade oblong, 27-30 × 2.8-4 cm, leathery, apex obtuse. Scapes 1 or 2, from base of pseudobulbs, erect, 14-18 cm; umbel 6-10-flowered; peduncle with 3 or 4 sheaths 12-15 mm; floral bracts lanceolate, ca. 6 mm, apex acuminate. Pedicel and ovary ca. 11 mm. Flowers yellowish green with red spots. Dorsal sepal ovate, concave, ca. 6 × 3.2 mm, margin irregularly toothed or slightly erose, apex obtuse; lateral sepals lanceolate, ca. 32 × 3 mm, 5-veined, base finely papillate abaxially, twisted near base, their upper and lower edges connate to each other forming a horn-shaped synsepal. Petals ovate-triangular, ca. 3 × 3 mm, base ca. 1/3 width adnate to column foot, margins fimbriate, apex aristate; lip subovate-lanceolate, ca. 3 × 0.7 mm, fleshy, grooved at base, apex acuminate. Column ca. 2 mm, stout, with slightly enlarged wings; foot ca. 3 mm, with free part ca. 2 mm; stelidia ca. 0.5 mm; anther cap ± finely papillate. Fl. Aug.
Tree trunks in forests; 600-2300 m. S and SW Yunnan [Bhutan, NE India, Myanmar, Nepal].