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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 cachimboense

HABIT Annual. Culms geniculately ascending; 20–60 cm long. Culm-internodes 5–11 cm long; distally glabrous. Culm-nodes brown; glabrous. Lateral branches ample; arising from mid culm and upper culm. Leaf-sheaths 5–8 cm long; mostly shorter than adjacent culm internode; without keel; pilose; with tubercle-based hairs. Ligule an eciliate membrane; 2–3 mm long. Collar pilose. Leaf-blades 14–19 cm long; 4–6 mm wide. Leaf-blade surface pilose; hairy abaxially; with tubercle-based hairs. Leaf-blade margins ciliate. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes; bracteate at branch bases. Peduncle 10–20 cm long; glabrous.

Racemes 1–4; single, or paired, or digitate; unilateral; 5–7 cm long. Rhachis broadly winged; 2–3 mm wide; terminating in a barren extension. Spikelet packing abaxial; 2 -rowed. Raceme-bases pubescent.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; plano-convex; acute; 4–4.3 mm long; 1.1 mm wide; falling entire. Rhachilla internodes elongated below proximal fertile floret. Rhachilla elongation 0.2 mm long.

GLUMES Glumes one the lower absent or obscure; reaching apex of florets; thinner than fertile lemma. Upper glume elliptic; 1 length of spikelet; chartaceous; without keels; 3 -veined. Upper glume surface pubescent; hairy at base. Upper glume margins ciliate. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret elliptic; 1 length of spikelet; membranous; 3 -veined; ribbed; tuberculate; setose; hairy above; ciliate on margins; fringed below; bearing hairs 1–2 mm long; obtuse. Fertile lemma elliptic; gibbous; 2.2–2.5 mm long; 0.8 mm wide; cartilaginous; pallid; without keel. Lemma surface papillose. Lemma margins involute. Palea involute; cartilaginous.

FLOWER Lodicules 2; 0.3 mm long. Anthers 3; 1.5 mm long.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: Brazil.

NOTES Paniceae. Davidse et al 2002.

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