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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Thrasya paspaloides
HABIT Perennial; caespitose. Culms erect; 15–70 cm long. Culm-nodes bearded. Leaf-sheaths keeled; glabrous on surface, or pilose; with tubercle-based hairs. Ligule an eciliate membrane; 1.3 mm long; erose. Leaf-blades linear, or lanceolate; 5–15 cm long; 2–3 mm wide. Leaf-blade surface pubescent; hairy on both sides. Leaf-blade margins ciliate.
INFLORESCENCE Inflorescence composed of racemes.
Racemes 1; single; arcuate; unilateral; 1–11 cm long. Rhachis broadly winged; folded longitudinally to embrace spikelets; 3 mm wide; glabrous on surface; tuberculate on margins; ciliate on margins; terminating in a barren extension; extension flattened. Rhachis hairs 3–4 mm long. Spikelet packing alternately adaxial and abaxial; regular; 1 -rowed.
Spikelets pectinate; in pairs. Fertile spikelets sessile and pedicelled; 2 in the cluster. Pedicels fused to internode; united wholly.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 2.9–3.1 mm long; 0.8 mm wide; falling entire.
GLUMES Glumes one the lower absent or obscure; reaching apex of florets; thinner than fertile lemma. Upper glume elliptic; 2.9–3.1 mm long; 1.1 length of adjacent fertile lemma; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume surface pilose; hairy generally; with tubercle-based hairs. Upper glume margins ciliate. Upper glume hairs yellow; 1.5–2 mm long. Upper glume apex acute.
FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret elliptic, or oblong; 2.9–3.1 mm long; 1 length of spikelet; chartaceous; sulcate and readily splitting into two halves; with basal tufts of hair; 1 hair tufts in all; ciliate on margins (above); acute. Palea of lower sterile floret becoming indurate on flanks at maturity. Fertile lemma elliptic; 2–3 mm long; coriaceous; without keel. Lemma surface striate; with conspicuous apical hairs. Lemma margins involute. Lemma apex acute. Palea coriaceous.
FLOWER Lodicules 2; fleshy; truncate. Anthers 3.
DISTRIBUTION South America: Caribbean, northern South America, and Brazil.
NOTES Paniceae. Burman 1993.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
