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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 yecorae
HABIT Perennial. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Culms decumbent; 80 cm long; rooting from lower nodes. Culm-internodes elliptical in section; 6–7 cm long; distally glabrous. Culm-nodes brown; glabrous, or pubescent. Lateral branches sparse; arising from mid culm. Leaf-sheaths subequal to internodes; glabrous on surface. Leaf-sheath oral hairs ciliate (sparsely). Ligule an eciliate membrane; 1.8–2.8 mm long; brown. Collar glabrous, or ciliate. Leaf-blade base broadly rounded, or cordate. Leaf-blades linear, or lanceolate; 9–20 cm long; 6–9 mm wide. Leaf-blade midrib keeled beneath. Leaf-blade surface glabrous. Leaf-blade margins scaberulous. Leaf-blade apex attenuate.
INFLORESCENCE Inflorescence composed of racemes; terminal and axillary.
Racemes 13; borne along a central axis; ascending; unilateral; 1.5–4 cm long. Central inflorescence axis 6 cm long; glabrous. Rhachis wingless; flattened; 0.5–0.6 mm wide; scaberulous on margins. Spikelet packing 4 -rowed. Raceme-bases brief; pilose.
Spikelets in pairs. Fertile spikelets pedicelled. Pedicels unequal; 0.5–1 mm long; glabrous.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or obovate; dorsally compressed; plano-convex; obtuse, or subacute; 1.4–1.5 mm long; 1.1–1.2 mm wide; falling entire.
GLUMES Glumes one the lower absent or obscure; shorter than spikelet; thinner than fertile lemma. Upper glume ovate; 1.3–1.4 mm long; 0.9 length of spikelet; membranous, or chartaceous; without keels; 5 -veined. Upper glume surface glabrous. Upper glume hairs 1 mm long.
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, or chartaceous; 3–5 -veined. Fertile lemma ovate; 1.4–1.5 mm long; 1.1–1.2 mm wide; indurate; pallid; without keel. Lemma surface papillose and striate. Lemma margins involute. Lemma apex obtuse. Palea involute; indurate.
FLOWER Lodicules 2; 0.3 mm long. Anthers 3; 0.3–0.9 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.
