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Descriptions

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

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

Thrasya setosa

HABIT Perennial; caespitose. Culms geniculately ascending, or decumbent; 40–70 cm long. Culm-nodes bearded. Leaf-sheaths keeled; pilose; with simple hairs, or tubercle-based hairs. Leaf-sheath oral hairs ciliate. Ligule an eciliate membrane; 1.5 mm long; erose. Leaf-blades 10–30 cm long; 2–3 mm wide. Leaf-blade surface pubescent, or pilose; hairy on both sides; with tubercle-based hairs. Leaf-blade margins tuberculate-ciliate. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence composed of racemes; terminal and axillary.

Racemes 1; single; arcuate; unilateral; 3–12 cm long. Rhachis narrowly winged; folded longitudinally to embrace spikelets; 2 mm wide; glabrous on surface; tuberculate on margins; ciliate on margins; terminating in a barren extension; extension flattened. 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, or oblong; dorsally compressed; 4 mm long; 1 mm wide; falling entire.

GLUMES Glumes one the lower absent or obscure; reaching apex of florets; thinner than fertile lemma. Upper glume lanceolate; 1.1 length of adjacent fertile lemma; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume margins ciliate. Upper glume apex acute.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret lanceolate; 0.9 length of spikelet; coriaceous; sulcate and readily splitting into two halves; with basal tufts of hair; 1 hair tufts in all; ciliate on margins (above); bearing yellow hairs; acute. Palea of lower sterile floret becoming indurate on flanks at maturity. Fertile lemma elliptic; 2.4 mm long; coriaceous; without keel. Lemma surface papillose and striate; with conspicuous apical hairs. Lemma margins involute. Lemma hairs 0.7 mm long. Lemma apex acute. Palea coriaceous.

FLOWER Lodicules 2; fleshy; truncate. Anthers 3.

DISTRIBUTION South America: northern South America.

NOTES Paniceae. Burman 1993.

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