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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 granitica
HABIT Perennial; caespitose. Culms erect, or geniculately ascending, or decumbent; 30–60 cm long. Culm-nodes glabrous. Leaf-sheaths keeled; glabrous on surface, or pilose; with tubercle-based hairs; outer margin hairy. Ligule an eciliate membrane; 1.5 mm long; pilose on abaxial surface. Leaf-blades 3.5–10 cm long; 4 mm wide. Leaf-blade surface puberulous; hairy on both sides. Leaf-blade apex acuminate.
INFLORESCENCE Inflorescence composed of racemes; terminal and axillary.
Racemes 1; single; arcuate; unilateral; 5–7 cm long. Rhachis narrowly winged; folded longitudinally to embrace spikelets; 1 mm wide; glabrous on surface; scabrous on margins, or tuberculate on margins; glabrous on margins, or 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; pubescent.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or oblong; dorsally compressed; acute; 2.4–2.6 mm long; 0.7 mm wide; falling entire.
GLUMES Glumes dissimilar; shorter than spikelet; thinner than fertile lemma. Lower glume oblate; 0.2 mm long; 0.1 length of spikelet; membranous; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume apex obtuse. Upper glume elliptic; 0.8 length of spikelet; membranous; without keels; 7 -veined. Upper glume lateral veins without cross-veins, or transversely connected at apex. Upper glume apex acute.
FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret oblong; 1 length of spikelet; coriaceous; sulcate; papillose; obtuse. Palea of lower sterile floret becoming indurate on flanks at maturity. Fertile lemma elliptic; 2.1 mm long; coriaceous; without keel. Lemma surface papillose and striate. Lemma margins involute. Lemma apex acute; without ornament. 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.
