草石斛（中国高等植物图鉴）
小密石斛（云南种子植物名录）
Dendrobium compactum Rolfe ex W. Hackett in Gard. Chron. ser. 3, 36: 400. 1904; Rolfe in Kew Bull.: 113. 1906; Kraenzl. in Engler, Pflanzer. 45 (IV. 50, II. B. 21): 84. 1910; Z. H. Tsi in Acta Phytotax. Sin. 18 (4): 436. 1980; Seidenf. in Opera Bot. 83: 145. 1985; Z. H. Tsi, S. C. Chen et K. Mori, Wild Orch. China: 87, pl. 112. 1997.
Epiphytic on tree trunks in broad-leaved forests; 1600-1900 m. S Yunnan [Myanmar, N Thailand]. |
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Stems cylindric, ± fusiform, 1.5-3 cm, 4-5 mm in diam., fleshy, with 3-6 nodes, current ones enclosed in leaf sheaths, previous year’s naked stems golden yellow. |
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Leaves 2-5, distichous, alternate, lowermost smaller than upper, oblong, 1-2.5 × 0.4-0.6 cm or more, herbaceous, base dilated into sheaths, apex obtuse and unequally bilobed; leaf sheaths obliquely drum-shaped, papery, loosely clasping; sheath mouth obliquely truncate. |
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Inflorescences 1-5, subterminal or lateral on upper part of current year’s stem, erect, usually 1-2 cm, not exceeding leaves, 3-6-flowered; floral bracts ovate-lanceolate, 2-3 × ca. 1 mm, 1-veined, acute. Pedicel and ovary ca. 4 mm. Flowers spreading, white, lip pale green. Dorsal sepal ovate-oblong, ca. 4 × 1.8 mm, 3-veined, acute; lateral sepals obliquely triangular-lanceolate, ca. 4 × to 3.5 mm, 3- or 4-veined, base oblique, apex acute; mentum conic. Petals suborbicular, ca. 4 × 1.7 mm margin slightly undulate, apex acute; lip suborbicular, ca. 5 × 4 mm, inconspicuously 3-lobed; lateral lobes subrounded, margin finely toothed above middle; mid-lobe broadly ovate-triangular, margin cristate-corrugate, apex mucronate; disk with fleshy ridges combined by 2 or 3 lamellae, apex slightly narrowed. Column ca. 2 mm, upper part enlarged; anther cap broadly conic, front margin slightly notched.Flowering September-October. |
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Capsule ovoid, ca. 5 mm in diam., with 3 ribs. |
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