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Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Paspalum clavuliferum
HABIT Annual; caespitose. Culms erect; 10–30 cm long; 0.5–1 mm diam. Culm-internodes hollow; distally glabrous. Culm-nodes glabrous. Lateral branches sparse. Leaves mostly basal. Leaf-sheaths pilose; with tubercle-based hairs; outer margin hairy. Ligule an eciliate membrane; 0.7–1 mm long; brown. Leaf-blades 3–9 cm long; 1.5–3 mm wide. Leaf-blade midrib prominent beneath. Leaf-blade surface pilose; with tubercle-based hairs. Leaf-blade margins ciliate.
INFLORESCENCE Inflorescence composed of racemes; terminal and axillary.
Racemes 1–2; single, or paired; arcuate; unilateral; 1–4 cm long. Rhachis wingless; angular; 0.4–0.5 mm wide. Spikelet packing 4 -rowed.
Spikelets in pairs. Fertile spikelets pedicelled. Pedicels 0.2–0.5 mm long; puberulous.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets obovate; dorsally compressed; 1.2–1.4 mm long; falling entire.
GLUMES Glumes one the lower absent or obscure; reaching apex of florets; thinner than fertile lemma. Upper glume ovate; 1 length of spikelet; membranous; without keels; 3 -veined. Upper glume surface pubescent; with capitate hairs.
FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; elliptic; 1 length of spikelet; membranous; 3 -veined; eciliate on margins, or ciliate on margins (capitate hairs). Fertile lemma obovate; 1.2–1.4 mm long; indurate; pallid; without keel. Lemma surface striate. Lemma margins involute. Palea involute; indurate.
FLOWER Anthers 3; 0.2–0.3 mm long; brown.
FRUIT Caryopsis with adherent pericarp; obovoid; 0.8 mm long.
DISTRIBUTION North America: Mexico. South America: Mesoamericana, Caribbean, northern South America, western South America, and Brazil.
NOTES Paniceae. Fl Costaric 1993.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.