GrassBase - The Online World Grass Flora


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

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

Oryza longiglumis

HABIT Perennial. Culms erect; 60–120 cm long. Culm-nodes glabrous. Ligule an eciliate membrane; 2–3 mm long; trilobed. Leaf-blades 15–30 cm long; 6–8 mm wide. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle; embraced at base by subtending leaf.

Panicle contracted; lanceolate, or elliptic; 10–20 cm long. Primary panicle branches ascending; 2–3 -nate. Panicle branches angular; smooth.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels linear; angular; 4–12 mm long; tip cupuliform and lobed.

FERTILE SPIKELETS Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 7–8 mm long; 1.5–2 mm wide; falling entire. Spikelet callus glabrous; base truncate.

GLUMES Glumes both absent or obscure.

FLORETS Basal sterile florets similar; barren; without significant palea. Lemma of lower sterile floret subulate; 10–14 mm long; 1.4–1.8 length of spikelet; without lateral veins. Lemma of upper sterile floret subulate; 10–14 mm long; 1 length of lower sterile floret. Fertile lemma elliptic; laterally compressed; 7–8 mm long; coriaceous; keeled; 5 -veined. Lemma midvein spinulose. Lemma surface scabrous; rough on veins. Lemma margins interlocking with palea margins. Lemma apex rostrate; awned; 1 -awned. Principal lemma awn 15–26 mm long overall; limb scabrous. Palea elliptic; coriaceous; 3 -veined; 1-keeled. Palea keels spinulose. Palea surface granular. Palea apex acute.

FLOWER Lodicules 2; membranous. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Disseminule comprising a floret.

DISTRIBUTION Asia-tropical: Papuasia.

NOTES Oryzeae. Jansen.

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