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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 brachyantha

HABIT Annual; caespitose. Culms decumbent, or prostrate; 30–80(–100) cm long; 3–6(–8) -noded; rooting from lower nodes. Leaf-sheaths smooth; glabrous on surface. Leaf-sheath auricles falcate. Ligule an eciliate membrane; 1–2 mm long; entire, or lacerate; truncate. Leaf-blades 7–19 cm long; 1–5 mm wide. Leaf-blade surface smooth, or scaberulous; rough adaxially. Leaf-blade margins scaberulous. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 13–30 cm long; 2.5–5 cm wide. Primary panicle branches appressed, or ascending. Panicle branches angular; smooth, or scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels linear; angular; 1.5–2.5 mm long; scaberulous; tip cupuliform.

FERTILE SPIKELETS Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 6.5–9.25 mm long; 1.25–1.5 mm wide; falling entire. Spikelet callus glabrous; base truncate; attached obliquely.

GLUMES Glumes both absent or obscure.

FLORETS Basal sterile florets similar; barren; without significant palea. Lemma of lower sterile floret subulate; 1.3–2.5 mm long; 0.2–0.3 length of spikelet. Lemma of upper sterile floret subulate; 1.3–2.5 mm long; 1 length of lower sterile floret. Fertile lemma elliptic; laterally compressed; 6.5–9.25 mm long; chartaceous; keeled; 5 -veined. Lemma midvein ciliate; hairy above. Lemma surface reticulate; glabrous, or hispidulous. Lemma margins involute. Lemma apex rostrate; awned; 1 -awned. Principal lemma awn straight, or flexuous; 70–170 mm long overall; limb scabrous. Palea elliptic; 1 length of lemma; chartaceous; 3 -veined; 1-keeled. Palea keels scabrous. Palea apex acute.

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

FRUIT Caryopsis with adherent pericarp; ellipsoid; 4–4.75 mm long; dark brown. Disseminule comprising a floret.

DISTRIBUTION Africa: west tropical, west-central tropical, northeast tropical, and southern tropical.

NOTES Oryzeae. FZ.

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