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Pakistan | Family List | Poaceae

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.

1 Inflorescence a dense ovoid spike-like panicle   Fingerhuthia
+ Inflorescence composed of 1-sided spikes, not a spikelite panicle   (2)
2 (1) Inflorescence of pedunculate groups of spikelets secund and distant on a tough solitary axis   Melanocenchris
+ Inflorescence not as above; spikelets densely biseriate, subsessile   (3)
3 (2) Spikelets ± sunk in the thick tough rhachis   Oropetium
+ Spikelets not sunk in a thick tough rhachis   (4)
4 (3) Spikelets 1-flowered, bisexual, usually without sterile florets above, sometimes a tiny vestigial floret present on the rhachilla extension   (5)
+ Spikelets obviously several-flowered, the lower 1-2 (-4) bisexual; rhachilla produced and bearing 1-several empty lemmas   (6)
5 (4) Lemmas long-awned   Schoenefeldia
+ Lemmas without awns   Cynodon
6 (4) Fertile florets 24; spikes 1-3   Tetrapogon
+ Fertile floret solitary, rarely 2 or 3; spikes 4 or more   Chloris

Lower Taxa


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