GrassBase - The Online World Grass Flora


W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Paspalum cinerascens

HABIT Perennial; caespitose. Culms 100–300 cm long; 2–3 mm diam. Culm-nodes brown; pubescent. Leaf-sheaths hirsute, or hispid. Ligule an eciliate membrane; 2 mm long. Leaf-blades 20–30 cm long; 12 mm wide. Leaf-blade surface glabrous, or pilose; sparsely hairy; with tubercle-based hairs.

INFLORESCENCE Inflorescence composed of racemes; with 1–2 peduncles per sheath. Peduncle 5–40 cm long; glabrous.

Racemes 1–2(–5); single, or paired, or digitate; unilateral; 15–25 cm long. Rhachis narrowly winged; 1–1.7 mm wide; with scattered hairs, or glabrous on surface; terminating in a barren extension; extension flattened. Spikelet packing alternately adaxial and abaxial; regular; 2 -rowed.

Spikelets in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels fused to internode; united wholly; oblong; 0.5–1 mm long; pubescent.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or ovate; dorsally compressed; plano-convex; 3.3–4.2 mm long; 1.8–2.5 mm wide; falling entire.

GLUMES Glumes dissimilar; shorter than spikelet; thinner than fertile lemma. Lower glume oblate; 1.5–2.5 mm long (on short pedicel), or 0.7–1.2 mm long (on long pedicel); 0.2–0.6 length of spikelet; hyaline; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex obtuse. Upper glume elliptic; 0.9 length of spikelet; membranous; without keels; 7–9 -veined. Upper glume lateral veins with cross-veins; excurrent. Upper glume apex erose (splitting along veins at maturity).

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret elliptic; 1 length of spikelet; coriaceous; 5 -veined; with cross-veins; acute. Palea of lower sterile floret 1 length of lemma. Fertile lemma ovate; 3–4 mm long; coriaceous; pallid and purple; tipped with last colour; without keel. Lemma surface granulose. Lemma margins involute. Lemma apex acute. Palea coriaceous.

DISTRIBUTION South America: northern South America, Brazil, and southern South America.

NOTES Paniceae. Fl Guiana 1997.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.