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Oryza sativa L.
Family Poaceae
Common name: Rice

Oryza sativa L. APNI*

Description: Tufted semi-aquatic annuals to short lived perennials to 1.2 m high. Culms erect, smooth, glabrous; nodes 3–4, smooth, glabrous. Sheaths tightly enclosinf culm, becoming loose with age, smooth, glabrous.

Ligule membranous, 3–16 mm long, triangular, rim often pilose with hairs to 2 mm long; auricles membranous, curved, usually with hairs to 3 mm long; blade 6–11 mm wide, smooth, glabrous, margin scabrous or smooth.

Inflorescence paniculate, open, nodding, 8–21 cm long (excluding awns), to 5 cm wide (excluding awns). Spikelets solitary, c. 7 mm long (excluding awn), c. 3 mm wide, florets 3, lowest 2 sterile, uppermost floret female; pedicels 1–6 mm long, smooth, glabrous. Glumes scale-like, c. 0.25 mm long. Sterile lemmas c. 2 mm long, acute, awnless, smooth, glabrous; palea absent. Fertile lemma 6–7 mm long (excluding awn), acute or acuminate, awned, 5-nerved, nerves with rigid hairs to 1 mm long; awn terminal, straight, to 46 mm long, scabrous, base often smooth; palea subequal to lemma, acuminate, 1-keeled, keel and apex often with rigid hairs to 1 mm long, colliculate.

Flowering: summer.

Distribution and occurrence:

Grown as a crop and sometimes in roadside ditches and drains, especially in rice areas.
NSW subdivisions: *CC, *NWP, *SWP
Other Australian states: *Qld *W.A. *N.T.
AVH map***

Text by S. W. L. Jacobs & K. L. McClay; updated Jacobs, S.W.L., Whalley, R.D.B. & Wheeler, D.J.B.
Taxon concept: Flora of NSW 4 (1993); Grasses of New South Wales, Fourth Edition (2008).

APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.
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