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 rojasii

HABIT Perennial; caespitose. Basal innovations intravaginal. Culms erect; 40–65 cm long; 1–4 -noded. Leaves mostly basal. Leaf-sheaths 5–20 cm long; longer than adjacent culm internode; hirsute. Ligule a fringe of hairs; 0.2–0.5 mm long. Leaf-blades flat, or involute; 10–30 cm long; 1.5–3 mm wide. Leaf-blade surface scabrous; glabrous; hairless except near base. Leaf-blade apex acuminate.

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

Panicle open; obovate; 20–50 cm long. Primary panicle branches appressed, or ascending; 10–20 cm long. Panicle branches capillary; scabrous; bearded in axils.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 3–7 fertile florets; with diminished florets at the apex. Spikelets linear, or lanceolate; laterally compressed; 4–8 mm long; 1.2–3 mm wide; breaking up at maturity; rhachilla persistent; retaining paleas. Rhachilla internodes eventually visible between lemmas.

GLUMES Glumes deciduous; similar; shorter than spikelet. Lower glume lanceolate; 2.5–4 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 2.7–4 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 acuminate.

FLORETS Fertile lemma ovate; 3.1–4.5 mm long; membranous; keeled; 3 -veined. Lemma midvein scabrous. Lemma lateral veins obscure. Lemma apex acute. Palea keels scabrous; adorned above. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; cuneate; fleshy. Anthers 3; 0.6–0.8 mm long.

FRUIT Caryopsis with adherent pericarp; ovoid; sulcate on hilar side; 1–1.1 mm long; light 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.