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Agrostis Linn., Sp. Pl. 1:61. 1753. Gen. Pl., ed. 5, 30. 1754; Boiss., Fl. Or. 5:513. 1884; Hook.f., Fl. Brit. Ind. 7:253. 1896; Bor, Fl. Assam 5:138. 1940; Sultan & Stewart, Grasses W. Pak. 2:300. 1959; Bor, Grasses Burma Ceyl. Ind. Pak. 383. 1960; Bor in Towns., Guest & Al-Rawi, Fl. Iraq 9:282. 1968; Bor in Rech. f., Fl. Iran. 70:293. 1970; Tzvelev, Poaceae URSS 325. 1976; Tutin in Tutin et al., Fl. Eur. 5:232. 1980.
Trichodium Michx.Vilfa Adans.
Annuals or perennials. Leaf-blades linear to subulate. Panicle usually much divided, rarely spike-like. Spikelets linear-lanceolate to oblong, small, often gaping and with the rhachilla prolonged beyond the floret; glumes persistent (rarely the spikelet falling entire), subequal, mostly lanceolate and acute to acuminate, membranous, often shining, 1(-3)-nerved; lemma oblong to elliptic, shorter than the glumes, truncate or denticulate, thin, (3-)5-nerved with the nerves often excurrent into mucros, awnless or awned from the back; callus small, obtuse, glabrous or pubescent (rarely bearded); palea usually shorter than the lemma, sometimes obsolete.
A genus of 150-200 species mainly in temperate and cold regions, especially in the northern hemisphere; 8 species occur in Pakistan.
There are unconfirmed reports of the following species in Pakistan: Agrostis nervosa Nees ex Trin. (like Agrostis vinealis, but spikelets 2.5-3 mm and anthers less than 1 mm long); Agrostis micrantha Steud. (similar to Agrostis nervosa but spikelets 2mm long); Agrostis capillarys Linn. (Agrostis tenuis Sibth.) (like Agrostis gigantean, but inflated pedicel tip smooth).
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| 1 |
Spikelets falling entire attached to the pedicel |
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(2) |
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Spikelets not falling entire, the rhachilla breaking up at maturity above the persistent glumes |
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(3) |
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| 2 (1) |
Spikelets, 1.5-2.5 mm long; palea almost as long as the lemma; anthers 0.5-0.7 mm long |
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Agrostis viridis |
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Spikelets 3-4 mm long; palea two-thirds the length of the lemma; anthers 1-1.5 mm long |
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Agrostis hissarica |
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| 3 (1) |
Lemma hairy |
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(4) |
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Lemma glabrous |
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(5) |
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| 4 (3) |
Palea about as long as the lemma; awn, when present, short and straight |
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Agrostis munroana |
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Palea not more than a third the length of the lemma; awn long and twisted below |
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Agrostis pilosula |
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| 5 (3) |
Palea minute, much less than half as long as the lemma |
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(6) |
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Palea at least half as long as the lemma |
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(7) |
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| 6 (5) |
Anthers 1-1.5 mm long; awn, when present, arising from slightly below the middle of the lemma; panicle lanceolate to narrowly ovate or oblong |
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Agrostis vinealis |
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Anthers 05-0.8 mm long; awn, when present, arising from slightly above the middle of the lemma; panicle very narrow, interrupted |
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Agrostis filipes |
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| 7 (5) |
Plant with stolons but without rhizomes; panicle contracted after anthesis |
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Agrostis stolonifera |
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Plant with rhizomes but without stolons; panicle loose and open after anthesis |
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Agrostis gigantea |
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Lower Taxa
Related Synonym(s):
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Treatments in Other Floras @ www.efloras.org
Other Databases
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