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FOC | Family List | FOC Vol. 22 | Poaceae

94. Phleum Linnaeus, Sp. Pl. 1: 59. 1753.

梯牧草属 ti mu cao shu

Authors: Sheng-lian Lu & Sylvia M. Phillips

Annual or perennial, often shortly rhizomatous. Leaf blades linear, flat. Inflorescence a spikelike, cylindrical panicle, elongate to ovoid or capitate; branches short, sometimes adnate to axis, spikelets densely crowded, subsessile. Spikelets strongly laterally compressed, floret 1, disarticulating above glumes; rachilla extension present or absent; glumes equal, oblong or obovate in side view, longer than and enclosing floret, herbaceous, 3-veined, strongly keeled, keel often pectinate-ciliate, margins overlapping but not connate, apex truncate to acute, with stout mucro or short stiff awn; lemma broadly oblong or ovate, thinly membranous, dorsally convex, 3–7-veined, apex truncate to subacute, awnless or mucronate; palea slightly shorter than lemma, ciliate along keels; lodicules 2; stamens 3. Caryopsis ellipsoid to ovoid.

Sixteen species: temperate and cold regions of the N hemisphere, extending southward in America along mountain chains into Chile; four species in China.

1 Annual, lacking non-flowering shoots at anthesis; spikelets obovate-cuneate; glumes firm, inflated.   1 P. paniculatum
+ Perennial, with non-flowering shoots at anthesis; spikelets oblong; glumes membranous, not inflated   (2)
2 (1) Panicle broadly cylindrical or ovoid; glumes with 1.5–3 mm awns; spikelets purplish.   2 P. alpinum
+ Panicle narrowly cylindrical; glumes with 0.3–1.5 mm awns; spikelets gray-green   (3)
3 (2) Glumes pectinate-ciliate along keel; culms swollen at base.   3 P. pratense
+ Glumes scabrid along keel; culms not swollen at base.   4 P. phleoides

Lower Taxa


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