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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Eragrostis maypurensis
HABIT Annual. Culms erect, or geniculately ascending, or decumbent; 15–70 cm long; 0.5–1 mm diam. Culm-internodes distally glabrous. Culm-nodes glabrous. Lateral branches lacking, or sparse. Leaf-sheaths glabrous on surface to pilose. Leaf-sheath oral hairs ciliate; 2–4 mm long. Ligule a fringe of hairs; 0.2–0.3 mm long. Leaf-blades 4–15 cm long; 2–4 mm wide. Leaf-blade surface glabrous, or pilose; hairy adaxially, or on both sides; with tubercle-based hairs.
INFLORESCENCE Inflorescence a panicle. Peduncle 7–15 cm long; glabrous, or pilose above.
Panicle open; pyramidal; dense; 4–20 cm long. Primary panicle branches 1 -nate; simple, or sparsely divided; 2–4.5 cm long; bearing spikelets almost to the base. Panicle branches glabrous to pilose; bearded in axils.
Spikelets solitary. Fertile spikelets sessile, or pedicelled. Pedicels reduced to a stump; 0.2–0.5 mm long.
FERTILE SPIKELETS Spikelets comprising 10–27 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 7–12 mm long; breaking up at maturity; rhachilla persistent; retaining paleas; fragile above; with the distal florets falling as a whole.
GLUMES Glumes deciduous; similar; shorter than spikelet. Lower glume ovate; 1.5–2.5 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume ovate; 1.7–2.5 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; 1.9–2.7 mm long; membranous; keeled; 3 -veined. Lemma midvein scabrous. Lemma lateral veins prominent. Lemma apex caudate. Palea bowed outwards; 0.66 length of lemma. Palea keels scabrous. Apical sterile florets resembling fertile though underdeveloped.
FLOWER Lodicules 2; cuneate; fleshy. Anthers 2; 0.2 mm long; purple.
FRUIT Caryopsis with adherent pericarp; oblong; 0.5 mm long; red.
DISTRIBUTION North America: Mexico. South America: Mesoamericana, northern South America, western South America, and Brazil.
NOTES Eragrostideae. Fl Costa Rica 1994.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
