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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 eichingeri

HABIT Perennial; caespitose. Rhizomes short. Butt sheaths papery; pallid. Culms erect; 60–100 cm long; 2–3 mm diam. Culm-nodes constricted; pallid, or brown. Leaf-sheaths narrower than blade at the collar; keeled; smooth; glabrous on surface. Leaf-sheath oral hairs ciliate. Leaf-sheath auricles falcate. Ligule an eciliate membrane; 1–3 mm long; entire; truncate. Leaf-blades 10–25 cm long; 3–10 mm wide; glaucous. Leaf-blade surface smooth, or scabrous. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle. Peduncle antrorsely scabrous above.

Panicle open; lanceolate; 10–25 cm long. Primary panicle branches ascending. Panicle branches angular; scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels linear; angular; scaberulous; tip cupuliform.

FERTILE SPIKELETS Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic (narrowly); laterally compressed; rostrate; 4.5–5.8 mm long; 1.5–1.8 mm wide (3 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; 0.2 length of spikelet; membranous; 1 -veined; without lateral veins; acute. Lemma of upper sterile floret lanceolate; 1 length of lower sterile floret; membranous. Fertile lemma elliptic; laterally compressed; 4.5–5.8 mm long; coriaceous; keeled; 5 -veined. Lemma midvein spinulose. Lemma surface reticulate; hispidulous. Lemma margins involute. Lemma apex rostrate; awned; 1 -awned. Principal lemma awn 5–20 mm long overall. Palea elliptic; 1 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, and east tropical. Asia-tropical: India.

NOTES Oryzeae. WDC.

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