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Poaceae Tribe Chlorideae
Annual or perennial herbs. Leaf-blades narrow, usually flat; ligule a fringe of hairs or membranous. Inflorescence of 1-sided spikes, these usually solitary, digitate or scattered along an axis, very rarely a dense spike-like panicle; rhachis of the spike tough, rarely fragile or deciduous as a whole. Spikelets usually bisexual and all alike, 1-several-flowered but only 1 of the florets bisexual (except Tetrapogon and Neostapfiella), sometimes monoecious or dioecious and heteromorphous, usually disarticulating above the glumes at maturity, mostly laterally compressed; bisexual floret solitary, or with 1 or more male or barren florets above it, sometimes also with barren florets below; glumes herbaceous to hyaline, laterally compressed and often keeled, 1-3-nerved, sometimes awned, unequal or subequal, shorter than the floret or enclosing it, the lower glume adaxial; lemma membranous to chartaceous, 3-nerved (with few exceptions), the lateral nerves near the margin and often ciliate, entire, emarginate or 2-lobed, awned or awnless; palea hyaline, mostly shorter than the lemma; lodicules 2, rarely absent; stamens 3; stigmas 2. Grain with large embryo and small round hilum; starch grains compound. Chromosomes small, basic number 9 or 10.
Genera ± 45; throughout the tropics; 7 genera and 14 species in Pakistan.
A tribe closely approaching Eragrostideae, being distinguished by the single fertile floret per spikelet. The few exceptions to this rule, although trouble-some in artificial keys, are seldom difficult to place for the tribes also differ markedly in the general facies of their inflorescence.
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1 |
Inflorescence a dense ovoid spike-like panicle |
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Fingerhuthia |
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Inflorescence composed of 1-sided spikes, not a spikelite panicle |
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(2) |
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2 (1) |
Inflorescence of pedunculate groups of spikelets
secund and distant on a tough solitary axis |
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Melanocenchris |
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Inflorescence not as above; spikelets densely biseriate, subsessile |
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(3) |
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3 (2) |
Spikelets ± sunk in the thick tough rhachis |
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Oropetium |
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Spikelets not sunk in a thick tough rhachis |
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(4) |
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4 (3) |
Spikelets 1-flowered, bisexual, usually without sterile florets above, sometimes a tiny vestigial floret present on the rhachilla extension |
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(5) |
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Spikelets obviously several-flowered, the lower 1-2 (-4) bisexual; rhachilla produced and bearing 1-several empty lemmas |
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(6) |
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5 (4) |
Lemmas long-awned |
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Schoenefeldia |
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Lemmas without awns |
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Cynodon |
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6 (4) |
Fertile florets 24; spikes 1-3 |
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Tetrapogon |
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Fertile floret solitary, rarely 2 or 3; spikes 4 or more |
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Chloris |
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Lower Taxa
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