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.

Eragrostis boinensis

HABIT Annual; caespitose; clumped loosely. Culms erect, or geniculately ascending; 10–55 cm long. Culm-internodes distally glabrous. Lateral branches lacking. Leaf-sheaths glabrous on surface; outer margin glabrous, or hairy. Leaf-sheath oral hairs lacking, or ciliate. Ligule a fringe of hairs. Leaf-blades involute; 3–5 cm long; 1–2 mm wide. Leaf-blade surface pilose; hairy adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle glomerate; linear; interrupted; 3–25 cm long; 0.5–0.8 of culm length. Panicle axis dominant (the spikelets in sessile clumps); with lower internodes 2–5 cm long.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 10–50 fertile florets; with diminished florets at the apex. Spikelets linear, or oblong; laterally compressed; 6–25 mm long; 2–3 mm wide; breaking up at maturity; rhachilla persistent; retaining paleas.

GLUMES Glumes deciduous; similar; shorter than spikelet. Lower glume lanceolate; 1.2–2 mm long; 1 length of upper glume; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 1.2–2 mm long; 1 length of adjacent fertile lemma; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma ovate; 1.6–2 mm long; membranous; yellow, or light green; keeled; 3 -veined. Lemma lateral veins distinct; stopping well short of apex. Lemma apex acute. Palea 1 length of lemma. Palea keels scaberulous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 2.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Africa: western Indian ocean.

NOTES Eragrostideae. Gr Madag 1997.

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