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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 millegrana

HABIT Perennial; caespitose. Butt sheaths spongy. Culms erect, or geniculately ascending; robust; 90–200 cm long. Lateral branches lacking. Leaf-sheaths longer than adjacent culm internode; as wide as blade at the collar; reticulately veined; glabrous on surface. Leaf-sheath oral hairs ciliate. Ligule an eciliate membrane; 1.5–2 mm long. Collar glabrous, or pilose. Leaf-blades conduplicate; 30–75 cm long; 7–15 mm wide. Leaf-blade surface scabrous; rough abaxially; glabrous, or pubescent; hairy adaxially; with tubercle-based hairs. Leaf-blade margins spinulose. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes few, or numerous; 6–60; borne along a central axis; simply spaced; ascending, or spreading; unilateral; 6–16 cm long. Central inflorescence axis 6–30 cm long. Rhachis wingless; angular; 0.9–1.2 mm wide; scabrous on margins; ciliate on margins. Spikelet packing crowded; irregular. Raceme-bases brief; pilose.

Spikelets in pairs. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets orbicular; dorsally compressed; plano-convex; obtuse; 2–2.4 mm long; 2 mm wide; falling entire.

GLUMES Glumes one the lower absent or obscure; reaching apex of florets; thinner than fertile lemma. Upper glume orbicular; 1 length of spikelet; membranous; purple; without keels; 3 -veined. Upper glume apex obtuse.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; orbicular; 1 length of spikelet; membranous; purple; 3 -veined; obtuse. Fertile lemma orbicular; 2–2.1 mm long; indurate; pallid; without keel. Lemma margins involute. Lemma apex obtuse. Palea involute; indurate.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION North America: Mexico. South America: Mesoamericana, Caribbean, northern South America, western South America, Brazil, and southern South America.

NOTES Paniceae. Chase 1994.

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