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 stagnalis

HABIT Perennial. Cataphylls evident. Butt sheaths glossy; glabrous. Culms slender; 35–95 cm long; 3–5 -noded. Culm-internodes eglandular. Lateral branches lacking, or sparse. Leaf-sheaths tight; eglandular. Leaf-sheath oral hairs scanty, or lacking. Ligule a fringe of hairs; 0.1–0.3 mm long. Leaf-blades lanceolate, or elliptic; 1–2.8 mm wide. Leaf-blade surface scaberulous; rough adaxially; glabrous. Leaf-blade margins eglandular; scabrous.

INFLORESCENCE Inflorescence a panicle. Peduncle eglandular.

Panicle open; elliptic; 25–33 cm long; 6–8 cm wide. Primary panicle branches spreading, or drooping; distant; 4–9 cm long; naked below, or bearing spikelets almost to the base. Panicle axis eglandular. Panicle branches capillary; eglandular.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1–7.5 mm long; eglandular.

FERTILE SPIKELETS Spikelets comprising 10–61 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed, or subterete; 5.4–30 mm long; 0.8–1.5 mm wide; breaking up at maturity; rhachilla persistent; retaining paleas. Rhachilla internodes zig-zag; 0.4–0.5 mm long; obscured by lemmas.

GLUMES Glumes deciduous; similar; shorter than spikelet. Lower glume linear, or lanceolate; 0.9–1 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume linear, or lanceolate; 0.9–1.8 mm long; 0.5–0.6 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 1.5–2 mm long; membranous; dull; keeled; 3 -veined. Lemma apex acute, or acuminate. Palea oblanceolate; with flaps narrower than body; hyaline; 2 -veined. Palea keels scaberulous; adorned above. Palea surface smooth, or scaberulous (on flaps). Palea apex acute. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3; 0.2–0.4 mm long.

FRUIT Caryopsis with free soft pericarp; linear, or oblong; isodiametric; 0.5–0.8 mm long.

DISTRIBUTION Australasia: Australia.

NOTES Eragrostideae. Lazarides 1997.

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