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186. Holcoglossum Schlechter, Repert. Spec. Nov. Regni Veg. Beih. 4: 285. 1919.

槽舌兰属 cao she lan shu

Authors: Xiaohua Jin & Jeffrey J. Wood

Herbs, epiphytic, monopodial, small to moderate-sized. Stems enclosed by persistent leaf sheaths, rooting mostly from base or lower part. Leaves many, distichous, terete, subterete, or broadly subterete, fleshy, adaxially channeled, jointed and dilated into sheathing base. Inflorescences axillary, racemose, few to many flowered; rachis usually purple; floral bracts much shorter than pedicel and ovary. Flowers usually opening widely. Sepals subsimilar, dorsally usually ± carinate; lateral sepals often slightly larger, oblique. Petals similar to dorsal sepal; lip saccate or spurred, 3-lobed; lateral lobes erect beside entrance of spur, spotted; mid-lobe rather larger, often narrowed and with appendages at base; spur often cylindric and curved, attenuate toward tip, interior usually hispid papillose. Column short, thick, winged, with a very short but distinct foot; rostellum distinct, sometimes reduced, bilobed; pollinia 2, waxy, globose, porate, attached by a common, short, linear stipe to a broad viscidium.

Twelve species: mainly in China, extending to Vietnam, Laos, Thailand, Myanmar, and NE India; 12 species (seven endemic) in China.

1 Leaves broadly subterete, 5-10 mm wide.   1 H. amesianum
+ Leaves terete or subterete, 2-3(-4) mm wide   (2)
2 (1) Spur broadly saccate; mid-lobe of lip with an incurved margin, concave or shallowly cucullate at base.   2 H. subulifolium
+ Spur cylindric to hornlike; mid-lobe of lip flat, not concave nor cucullate at base   (3)
3 (2) Mid-lobe of lip entire or nearly entire, with fleshy and thickened callus at base; spur 7-8(-12) mm   (4)
+ Mid-lobe of lip with a denticulate or undulate margin, with crested lamellae at base; spur (8-)12-20 mm   (8)
4 (3) Plants erect; inflorescence 6-10-flowered.   9 H. rupestre
+ Plants pendulous or slanting; inflorescence 1-3-flowered   (5)
5 (4) Flowers very small (sepals 9-10 × 4-5 mm, petals ca. 8 × 4 mm), spur unornamented inside.   11 H. sinicum
+ Flowers medium to large, spur hispid papillate inside   (6)
6 (5) Leaves 4-8.5 cm × 3-4 mm; floral bracts 5-8 mm.   8 H. flavescens
+ Leaves 20-30 cm × ca. 2 mm; floral bracts ca. 2 mm   (7)
7 (6) Mid-lobe of lip semicircular.   10 H. weixiense
+ Mid-lobe of lip rhombic.   12 H. nujiangense
8 (3) Spur cylindric, not narrowed toward end; mid-lobe of lip ca. 2 × as long as spur.   7 H. wangii
+ Spur narrowed toward end; mid-lobe of lip nearly as long as spur   (9)
9 (8) Mid-lobe of lip suborbicular, purple.   3 H. kimballianum
+ Mid-lobe of lip ligulate to obovate-rhombic, white   (10)
10 (9) Lateral lobes of lip entire; mid-lobe obovate-rhombic; column foot indistinct.   4 H. quasipinifolium
+ Lateral lobes of lip bilobed, with 2 lobules; mid-lobe ligulate; column foot distinct, 1.5-2 mm   (11)
11 (10) Mid-lobe of lip ca. 2 × as long as wide, lower lobule of lateral lobe triangular.   5 H. omeiense
+ Mid-lobe of lip ca. 3 × as long as wide, lower lobule of lateral lobe ovate.   6 H. lingulatum

  • List of lower taxa


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