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FOC | Family List | FOC Vol. 22 | Poaceae

4. Poaceae Tribe ORYZEAE

稻族 dao zu

Authors: Liang Liu & Sylvia M. Phillips

Annuals or perennials. Leaf blades usually linear, rarely elliptic; ligule membranous. Inflorescence a panicle, occasionally with simple racemelike primary branches; spikelets all alike or the sexes separate. Spikelets with 1 floret, mostly laterally compressed, rachilla extension absent, falling entire; glumes absent or reduced to small scales at base of floret; lemma membranous to leathery, keeled, 5–10-veined, entire, with or without a straight awn from the apex; palea resembling lemma but narrower, 3–7-veined with central keel. Lodicules 2. Stamens usually 6 (1 in Chikusichloa). Caryopsis linear to ovoid. Leaf anatomy:non-Kranz; microhairs slender (apical cell short and inflated in Hygroryza); fusoid cells present or absent. x = 12 (in Zizania 15, 17).

Thirteen genera and ca. 70 species: tropical and warm-temperate regions of the world; five genera and thirteen species (two introduced) in China.

This is a widespread tribe of aquatic and marshland grasses. It can be recognized by its multi-veined keeled palea, and usually by the presence of 6 stamens.

1 Spikelet with 2 narrow scales below the floret.   37 Oryza
+ Spikelet without scales below the floret (if rarely present, anther 1)   (2)
2 (1) Spikelets unisexual.   41 Zizania
+ Spikelets bisexual   (3)
3 (2) Floret sessile; leaf blades linear.   38 Leersia
+ Floret stipitate   (4)
4 (3) Leaf blades linear, 20–50 cm; stamen 1.   39 Chikusichloa
+ Leaf blades elliptic, 3–7 cm; stamens 6.   40 Hygroryza

Lower Taxa


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  • FOC22_04_Oryzeae.pdf
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