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FOC | Family List | FOC Vol. 22 | Poaceae

152. Perotis Aiton, Hort. Kew. 1: 85. 1789.

茅根属 mao gen shu

Authors: Shou-liang Chen & Sylvia M. Phillips

Diplachyrium Nees.

Annuals or sometimes perennials. Leaf blades short, broad, base slightly cordate, margins often pectinate-ciliate; ligule a membranous rim. Inflorescence a cylindrical raceme of long-awned, solitary spikelets borne directly on main axis; rachis clothed in short pegs after spikelets have fallen. Spikelets linear-elliptic, terete or slightly laterally compressed, with 1 floret, falling entire, subsessile or borne on a pedicel-like callus which falls with spikelet; glumes subequal, as long as spikelet and enclosing floret, papery, 1-veined, rounded, scabrous, apex with a long slender awn far exceeding glume body, lower glume tightly embraced by upper glume, its awn usually longer than upper glume awn; lemma lanceolate, shorter than glumes, hyaline, 1-veined, glabrous, acute; palea hyaline, slightly shorter than lemma, flattened. Caryopsis terete or flattened, apex acute.

Thirteen species: Old World tropics; three species in China.

This is an easily recognizable genus on account of the delicate, elongate, violet-tinged, "bottlebrush" inflorescence of small, long-awned spikelets, which fall entire from the central axis.

1 Spikelets 3.5–4.5 mm; glume apex tapering into awn.   1 P. rara
+ Spikelets 1.5–2.5 mm; glume apex abruptly distinct from awn   (2)
2 (1) Spikelet callus 0.2–0.5 mm; glumes scabrid on keel, evenly hirtellous on back; leaf blades 2–5 mm wide; inflorescence up to 12 cm   2 P. indica
+ Spikelet callus 0.1–0.2 mm; glumes pectinate-ciliolate on keel, scaberulous-hirtellous in rows on lower back; leaf blades 4–7 mm wide; inflorescence up to 20 cm.   3 P. hordeiformis

Lower Taxa


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