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

2. Oplismenus compositus (Linnaeus) P. Beauvois, Ess. Agrostogr. 54. 1812.

竹叶草 zhu ye cao

Perennial. Culms stoloniferous, straggling, ascending to 20–80 cm. Leaf sheaths glabrous, pilose or tuberculate-hairy; leaf blades lanceolate to ovate-lanceolate, 3–20 × 0.5–3 cm, subglabrous to tuberculate-hairy, base usually oblique. Inflorescence axis 5–15 cm, glabrous to tuberculate-hairy; racemes 3–6, 2–6 cm, ascending to erect. Spikelets in 7–14 widely spaced, sometimes patent pairs, lanceolate, glabrous to thinly pilose; glumes herbaceous, awned, the awns stout, green or purple, viscid; lower glume awn 5–10 mm; upper glume awn to 3 mm or occasionally absent; lower lemma subcoriaceous, 7–9-veined, acute or with a stout 0.3–1 mm mucro; upper lemma subcoriaceous, ca. 2.5 mm, smooth. Fl. and fr. Sep–Nov. 2n = 54, 72*.

Moist places in forests and along forest margins, hill slopes. Fujian, Guangdong, Guangxi, Guizhou, Hainan, Jiangxi, Sichuan, Taiwan, Xizang, Yunnan, Zhejiang [Japan, Philippines, Thailand, and elsewhere in tropical Asia extending westward through India to E Africa; Australia, Pacific Islands (Polynesia)].

1 Panicle axis, rachis, leaf sheaths, and leaf blades pilose, hispid or tuberculate-hairy; upper glume awned   (2)
+ Panicle axis, rachis, leaf sheaths, and leaf blades glabrous, or puberulous or only ciliate at the mouth of the leaf sheath; or if panicle axis pilose, then upper glume awnless   (3)
2 (1) Leaf blades 5–10 × 0.5–1.8 cm.   2d var. intermedius
+ Leaf blades 10–20 × 2–3 cm.   2e var. owatarii
3 (1) Leaf blades 9–13 × 1.2–2.5 cm; spikelets 3.5–4 mm.   2c var. formosanus
+ Leaf blades 3–8 × 0.8–1.4 cm; spikelets 2.5–3.5 mm   (4)
4 (3) Upper glume with 1–2 mm awn.   2a var. compositus
+ Upper glume awnless.   2b var. submuticus


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