硬叶山兰（横断山区维管植物）
Oreorchis nana Schltr. in Acta Hort. Gothob. 1: 151. 1924; S. Y. Hu in Quart. J. Taiwan Mus. 27 (3, 4): 453. 1974; 秦岭植物志1: 429.图418. 1976: K. Y.Lang et Z. H. Tsi in Bot. Res. Inst. Bot. 6: 67. 1992;横断山区维管植物2: 2597. 1994; N. Pearce et Cribb in Edinb. J. Bot. 54 (3): 313, fig. 10 (f-h). 1997. ——Oreorchis oligantha Schltr., l. c. p. 152; N. Pearce et Cribb, l. c. 317. fig. 10 (a-e). 1997. ——Oreorchis rockii Schweinfurth in J. Arn. Arb. 10: 173. 1929.
Alpine grasslands, forests, thickets, soil-covered rocks; 2500-4000 m. W Hubei, W Sichuan, NW Yunnan. |
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Plants 8-16 cm tall. Pseudobulbs oblong to subovoid, 0.5-0.9(-1.5) × 0.4-0.6 cm, 2- or 3-noded, sometimes persisting and forming a chain of pseudobulbs connected by a short rhizome. |
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Leaf solitary, ovate to narrowly elliptic, plicate, 2-4 × 0.8-1.5 cm, base subrounded or broadly cuneate and abruptly contracted into a distinct petiole-like stalk 1-3 cm, apex acuminate. |
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Inflorescence 8-16 cm, with 2 or 3 tubular sheaths below middle; rachis 2.5-6 cm, subdensely (2-)5-14-flowered; floral bracts ovate-lanceolate, ca. 1 mm. Flowers white, outer surfaces of sepals and petals orange-yellow or green, rarely flushed chestnut, lip yellow with purple spots; pedicel and ovary 3-5 mm. Sepals narrowly oblong, 6-7 × 1.5-2 mm, apex obtuse or acute; lateral sepals somewhat falcate. Petals fusiform-oblong, 5.5-6.5 × ca. 2 mm, apex obtuse or acute; lip subobovate-oblong, 5-7 × ca. 2.5 mm, base shortly clawed or sometimes without a claw, 3-lobed below middle; lateral lobes incurved, narrowly oblong-ovate, ca. 0.8 × 0.5 mm, apex obtuse; mid-lobe obovate-elliptic, 3-4.5 × ca. 2.5 mm, margin slightly undulate, apex rounded; disk with a pair of short lamellae at base. Column slightly arcuate, 2-3 mm, thick. Fl. Jun-Jul. |
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