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Descriptions

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

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

Eragrostis seminuda

HABIT Perennial; caespitose. Basal innovations extravaginal. Culms erect; 15–50 cm long; 1–2 -noded. Leaf-sheaths 2–15 cm long; hirsute. Ligule a fringe of hairs; 0.1–0.3 mm long. Leaf-blades flat, or involute; 5–20 cm long; 1–3 mm wide. Leaf-blade surface hirsute; hairy on both sides. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate, or obovate; 10–30 cm long. Primary panicle branches spreading; whorled at lower nodes; 10–16 cm long. Panicle axis scabrous; with scattered hairs, or glabrous. Panicle branches bearded in axils.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 3–4 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 1.7–3.8 mm long; 1.2–1.7 mm wide; breaking up at maturity; rhachilla deciduous; disarticulating below each fertile floret. Rhachilla internodes pilose; hairy at tip.

GLUMES Glumes deciduous; similar; shorter than spikelet. Lower glume lanceolate; 1.1–1.5 mm long; 0.66 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 1.7–2.2 mm long; 0.9 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma ovate; 2–2.5 mm long; membranous; mid-green, or grey; keeled; 3 -veined. Lemma lateral veins obscure. Lemma margins ciliate; hairy in the middle. Lemma hairs 0.5–1 mm long. Lemma apex acuminate. Palea keels scabrous; adorned below. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; cuneate; fleshy. Anthers 3; 0.3–0.5 mm long.

FRUIT Caryopsis with adherent pericarp; ovoid; sulcate on hilar side; 0.5–1 mm long; dark brown; reticulate.

DISTRIBUTION South America: Brazil and southern South America.

NOTES Eragrostideae. Boech & Valls 1995.

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