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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Oryza punctata

HABIT Perennial; caespitose. Culms erect, or geniculately ascending, or decumbent; 50–120(–150) cm long; 3–6 mm diam.; spongy; 3–5 -noded. Leaf-sheaths smooth; glabrous on surface. Leaf-sheath auricles falcate. Ligule an eciliate membrane; 3–10 mm long; entire, or lacerate; truncate, or obtuse, or acute. Leaf-blades 15–45 cm long; 1–25 mm wide. Leaf-blade surface scaberulous; rough on both sides. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; elliptic; 15–35 cm long; 3–17 cm wide. Primary panicle branches ascending, or spreading. Panicle branches angular; scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels linear; angular; 2–5 mm long; scaberulous; tip cupuliform.

FERTILE SPIKELETS Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 4.9–6.2 mm long; 1.9–2.6 mm wide (2.5 times longer than wide); falling entire. Spikelet callus glabrous; base truncate; attached transversely.

GLUMES Glumes both absent or obscure.

FLORETS Basal sterile florets similar; barren; without significant palea. Lemma of lower sterile floret lanceolate; 1–1.5 mm long; 0.2 length of spikelet; membranous; 1 -veined; without lateral veins; acute. Lemma of upper sterile floret lanceolate; 1–1.5 mm long; 1 length of lower sterile floret; membranous. Fertile lemma elliptic; laterally compressed; 4.9–6.2 mm long; coriaceous; keeled; 5 -veined. Lemma midvein spinulose. Lemma surface reticulate; glabrous, or hispid. Lemma margins involute. Lemma apex rostrate; awned; 1 -awned. Principal lemma awn straight, or flexuous; (10–)20–75 mm long overall; limb scabrous. Palea elliptic; 0.9 length of lemma; coriaceous; 3 -veined; 1-keeled. Palea keels scabrous. Palea apex acute.

FLOWER Lodicules 2; lanceolate; membranous. Anthers 6. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Disseminule comprising a floret.

DISTRIBUTION Africa: west tropical, west-central tropical, northeast tropical, east tropical, southern tropical, south, and western Indian ocean. Asia-tropical: Indo-China.

NOTES Oryzeae. FZ.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.