反瓣石斛（植物分类学报）
黄毛石斛（云南种子植物名录）
Dendrobium ellipsophyllum T. Tang et F. T. Wang in Acta Phytotax. 1 (1): 41, 81, 1951; Seidenf. in Opera Bot. 83: 180. 1985; Averyanov, Vasc. Pl. Syn. Vietnam. Fl. 1: 71. 1990, et Iden. Guide Vietnam. Orch.: 200. 1994.——D. revolutum auct. non Lindl.: Z. H. Tsi in Acta Phytotax. Sin. 18 (4): 434. 1980.
Epiphytic on tree trunks in broad-leaved mountain forests; ca. 1100 m. SE Yunnan (Menghai, Mengla) [Cambodia, Laos, Myanmar, Thailand, Vietnam].
This species is close to Dendrobium revolutum Lindl., but the leaves of the latter are narrow and oblong, and the labial lobes are nearly semicircular. The petal apex is nearly round, and the edge has fine teeth, which is easy to distinguish. |
| |
Stems erect or ascending, cylindric, ca. 50 cm, ca. 5 mm in diam., uniformly thick, with longitudinal ribs, unbranched, with many nodes, internodes ca. 2 cm, enclosed in leaf sheaths. |
| |
Leaves alternate and dense along whole stem, elliptic, 4-5 × 1.5-1.9(or more) cm, base cordate, clasping and decurrent into sheaths tightly embracing stem, apex obtuse and unequally 2-lobed. |
| |
Inflorescences many, (apparently) leaf-opposed, 1-flowered; floral bracts small. Pedicel and ovary bent downward, ca. 2 cm, slender. Flowers scented, white, disk yellow above middle, keels brownish purple. Dorsal sepal reflexed, ovate-oblong, ca. 8 × 5 mm, apex acute; lateral sepals reflexed, oblong-lanceolate, ca. 8 × 5 mm, apex acute; mentum angulate, ca. 7 mm. Petals recurved, narrowly lanceolate, ca. 7 × 4 mm, apex acute; lip larger than sepals, fleshy, 3-lobed, ± decurved and folded along axis; lateral lobes deltoid, small, ca. 2 mm, acute; mid-lobe nearly transversely oblong or rounded, somewhat large, ca. 10 × 15 mm, subtruncate and broadly emarginate, central part of disk with 3 keeled ridges. Flowering June. |
| |
| ||
| ||
|
| |
|
| |
