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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 chiapense
HABIT Perennial. Rhizomes short. Culms erect, or geniculately ascending; 85 cm long. Culm-internodes distally glabrous. Culm-nodes brown. Lateral branches sparse; arising from upper culm. Leaf-sheaths longer than adjacent culm internode; without keel, or keeled; glabrous on surface, or pubescent; outer margin hairy. Leaf-sheath oral hairs ciliate. Ligule an eciliate membrane; 1–1.3 mm long. Collar pubescent. Leaf-blades lanceolate; 10–15 cm long; 6–8.3 mm wide. Leaf-blade surface glabrous, or puberulous. Leaf-blade margins tuberculate-ciliate. Leaf-blade apex attenuate.
INFLORESCENCE Inflorescence composed of racemes; terminal and axillary; with 1–2 peduncles per sheath.
Racemes 1–3; single, or paired, or borne along a central axis; unilateral; 3–3.7 cm long. Rhachis narrowly winged; flattened; 0.7–1 mm wide; smooth on surface, or scabrous on surface; scabrous on margins. Spikelet packing irregular; 4 -rowed. Raceme-bases brief; pubescent.
Spikelets in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels subequal; 0.5–1.4 mm long; scabrous.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or oblong; dorsally compressed; plano-convex; obtuse, or subacute; 2.6–2.8 mm long; 1.1–1.3 mm wide; falling entire.
GLUMES Glumes one the lower absent or obscure, or two; shorter than spikelet; thinner than fertile lemma. Lower glume linear (when present); 0.5–1 mm long; 0–1 -veined. Lower glume lateral veins absent. Upper glume ovate; 2.5–2.6 mm long; 0.9 length of spikelet; membranous; without keels; 5 -veined. Upper glume surface smooth; glabrous.
FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; elliptic; 1.4–1.5 mm long; 1 length of spikelet; membranous; 5 -veined. Fertile lemma ovate; 2.3–2.4 mm long; indurate; pallid; without keel. Lemma surface papillose. Lemma margins involute. Palea involute; 2–2.1 mm long; indurate.
FLOWER Lodicules 2; 0.25–0.3 mm long. Anthers 3; 0.8–0.9 mm long.
DISTRIBUTION North America: Mexico.
NOTES Paniceae. Sanchez-Ken 2012.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
