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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 plowmanii

HABIT Annual; caespitose. Culms erect; 50 cm long. Culm-internodes terete, or elliptical in section; 4–20 cm long; distally glabrous. Culm-nodes glabrous. Lateral branches sparse, or ample; arising from mid culm and upper culm. Leaf-sheaths 4–15 cm long; mostly shorter than adjacent culm internode; keeled; glabrous on surface, or pilose; with tubercle-based hairs. Ligule an eciliate membrane; 1–2.5 mm long; brown. Leaf-blades ascending; flat, or involute; 5–20 cm long; 4–7 mm wide. Leaf-blade surface glabrous, or pilose; hairy on both sides; with tubercle-based hairs. Leaf-blade apex acute.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1(–2); single; unilateral; 5–12 cm long. Rhachis angular; 0.5–1.5 mm wide; glabrous on surface; scabrous on margins. Spikelet packing irregular; 4 -rowed.

Spikelets in pairs. Fertile spikelets pedicelled. Pedicels subequal; scaberulous; bearing a few hairs.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or obovate; dorsally compressed; plano-convex; 3.2–4.4 mm long; 2–3.2 mm wide; falling entire.

GLUMES Glumes one the lower absent or obscure; shorter than spikelet; thinner than fertile lemma. Upper glume elliptic, or obovate; 2.8–4 mm long; 0.75 length of spikelet; membranous; without keels; 5(–7) -veined.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret elliptic, or obovate; 1 length of spikelet; membranous; 5(–7) -veined; wrinkled; glabrous. Fertile lemma elliptic; 3.2–4.2 mm long; 2–2.8 mm wide; indurate; light brown; without keel. Lemma surface papillose. Lemma margins involute. Palea involute; indurate.

FLOWER Lodicules 2; cuneate; 0.4 mm long; fleshy. Anthers 3; 2–2.4 mm long.

FRUIT Caryopsis with adherent pericarp; ellipsoid, or orbicular; plano-convex; 2–3.2 mm long; pallid. Embryo 0.5 length of caryopsis. Hilum linear; 0.5 length of caryopsis.

DISTRIBUTION South America: Brazil.

NOTES Paniceae. Morrone & Zuloaga 2004.

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