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FOC | Family List | FOC Vol. 22 | Poaceae | Oplismenus

4. Oplismenus patens Honda, Repert. Spec. Nov. Regni Veg. 20: 360. 1924.

疏穗竹叶草 shu sui zhu ye cao

Culms slender, 30–60 cm tall, glabrous. Leaf sheaths glabrous except for ciliate margins; leaf blades linear-lanceolate to ovate-lanceolate, 5–15 × 0.4–3.5 cm, glabrous on both surfaces; ligule membranous, ciliolate. Inflorescence axis 20–25 cm, glabrous or puberulous; racemes 5–8, 6–10 cm. Spikelets borne singly, ovate-lanceolate; glumes both awned; lower glume awn ca. 10 mm, upper glume awn 1/5–1/2 length of awn of lower glume; lower lemma equaling spikelet, 7–9-veined, dorsally puberulous, margins ciliate, awn 1–2.5 mm, lower palea absent; upper lemma papery or coriaceous, smooth, mucro 0.5–1 mm. Fl. and fr. Sep–Nov.

Undergrowth in moist forests on hillsides, moist places in open forests. Fujian, Guangdong, Hainan, Taiwan, Yunnan [Japan, N Vietnam].

This species is sometimes regarded as a variant of Oplismenus compositus.

1 Awn of upper glume 1/5 length of awn of lower glume; leaf blades linear-lanceolate to lanceolate, 0.4–0.7 cm wide.   4c var. angustifolius
+ Awn of upper glume 1/3–1/2 length of awn of lower glume; leaf blades lanceolate to lanceolate-ovate, 0.7–3.5 cm wide   (2)
2 (1) Leaf blades 10–15 × 2–3.5 cm.   4a var. patens
+ Leaf blades 5–9 × 0.7–1.8 cm.   4b var. yunnanensis


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