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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.
Paspalum pectinatum
HABIT Perennial; caespitose; clumped densely. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Culms 30–100 cm long; 1.5–2.5 mm diam. Culm-internodes hollow; distally glabrous. Lateral branches lacking. Leaf-sheaths pilose. Leaf-sheath oral hairs ciliate; 4–8 mm long. Ligule an eciliate membrane; 0.5–1 mm long; brown. Leaf-blades revolute; 11–65 cm long; 3–7 mm wide. Leaf-blade midrib prominent beneath. Leaf-blade surface pilose; densely hairy; hairy on both sides.
INFLORESCENCE Inflorescence composed of racemes. Peduncle pubescent above.
Racemes 2; paired; unilateral; 5–7 cm long. Rhachis broadly winged; membranous; 2–2.5 mm wide; pubescent on margins; terminating in a barren extension; extension flattened. Spikelet packing abaxial; 2 -rowed.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; with cordate base; dorsally compressed; 4.6–5.7 mm long; falling entire.
GLUMES Glumes one the lower absent or obscure; reaching apex of florets; thinner than fertile lemma. Upper glume ovate; auriculate at base; 1 length of spikelet; membranous; without keels; winged on margins; winged all along; 3 -veined. Upper glume apex acute.
FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; elliptic; 0.9 length of spikelet; membranous; 3 -veined; glabrous, or pilose; with tubercle-based hairs; tuberculate on margins; ciliate on margins; fringed all along; bearing hairs 1.5–2 mm long; acute. Fertile lemma ovate; 3.5–4.5 mm long; coriaceous; pallid; without keel. Lemma margins involute. Lemma apex acute; pubescent. Palea involute; coriaceous.
FLOWER Anthers 3; 2.2 mm long.
FRUIT Caryopsis with adherent pericarp.
DISTRIBUTION North America: Mexico. South America: Mesoamericana, northern South America, western South America, Brazil, and southern South America.
NOTES Paniceae. Fl Costaric 1993.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
