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FOC | Family List | FOC Vol. 25 | Orchidaceae | Zeuxine

9. Zeuxine nervosa (Wallich ex Lindley) Trimen, J. Ceylon Branch Roy. Asiat. Soc. 9: 90. 1885.

芳香线柱兰 fang xiang xian zhu lan

Monochilus nervosus Wallich ex Lindley, Gen. Sp. Orchid. Pl. 487. 1840; Adenostylis formosana (Rolfe) Hayata; A. zamboangensis Ames; Haplochilus nervosus (Wallich ex Lindley) D. Dietrich; Heterozeuxine nervosa (Wallich ex Lindley) T. Hashimoto; Zeuxine cognata Ohwi & T. Koyama; Z. fluvida Fukuyama; Z. formosana Rolfe; Z. hengchuanense S. S. Ying; Z. somae Tuyama; Z. vittata Rolfe ex Downie; Z. zamboangensis (Ames) Ames.

Plants 20-35 cm tall, slender. Rhizome elongate. Stem erect, 1-2 mm in diam., 3-6-leaved. Leaves clustered at stem apex, not usually withering at anthesis, adaxially green, usually with silvery blotches or a white line along midvein, ovate to ovate-elliptic, 4-6 × 1.5-2.5 cm, apex acute; petiole-like base 1-1.5 cm including tubular sheath. Inflorescence 18-28 cm, with 2 or 3 widely spaced sterile bracts, sparsely villous; rachis 3-10 cm, with a few to more than 10 subdensely arranged flowers; floral bracts reddish brown, ovate-lanceolate, cymbiform, 6-10 × 3-4.5 mm, abaxially puberulent to glabrous, margin ciliate, apex acuminate. Flowers fragrant, resupinate, weakly spreading, small; ovary and pedicel fusiform, 8-9 mm, glabrous to puberulent. Sepals reddish brown to yellowish green, glabrous; dorsal sepal ovate, concave, 5-5.5 × 4.5-5 mm, apex acute or subacuminate; lateral sepals oblong-ovate, 6-6.5 × ca. 3.5 mm, apex acute to obtuse. Petals white, ovate, oblique, ca. 5.5 × 3.2 mm, glabrous, apex obtuse; lip white or pale yellow, Y-shaped, to 7 mm, 3-partite; hypochile concave-saccate, ca. 2.5 × 2.5 mm, containing 2 2- or 3-digitate to narrowly lamellate calli; mesochile relatively long and narrow, ca. 1.5 mm, margin incurved; epichile dilated, ca. 4 mm wide, 2-lobed; lobes diverging at an acute angle, suborbicular, ca. 2 × 2 mm. Column ca. 2.2 mm; wings prominent, broadly triangular; rostellum arms ca. 1.2 mm. Fl. Feb-Mar. 2n = 20.

Damp places in forests; 200-1200 m. S Taiwan, S and SW Yunnan [Bangladesh, Bhutan, Cambodia, NE India, Japan (Ryukyu Islands), Laos, Nepal, Philippines, Sri Lanka, Thailand, Vietnam].


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