GrassBase - The Online World Grass Flora


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

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

Thrasya achlysophila

HABIT Perennial; caespitose. Culms erect, or geniculately ascending; 10–25 cm long. Culm-nodes glabrous. Leaf-sheaths longer than adjacent culm internode; keeled. Ligule an eciliate membrane; 1.5 mm long; erose. Leaf-blades lanceolate; 3–8 cm long; 5–8 mm wide. Leaf-blade surface pilose; densely hairy; hairy on both sides; with tubercle-based hairs. Leaf-blade margins ciliate.

INFLORESCENCE Inflorescence composed of racemes; terminal and axillary.

Racemes 1; single; arcuate; unilateral; 2–3 cm long. Rhachis narrowly winged; 1.2 mm wide; glabrous on surface; pubescent 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 ovate; dorsally compressed; 2.4–2.6 mm long; 1.1 mm wide; falling entire. Spikelet callus square; 0.5 mm long; pubescent.

GLUMES Glumes dissimilar; shorter than spikelet; thinner than fertile lemma. Lower glume oblate; 0.2–0.5 mm long; 0.1–0.2 length of spikelet; hyaline; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume apex obtuse. Upper glume elliptic; 0.75–0.8 length of spikelet; chartaceous; without keels; 7 -veined. Upper glume surface pilose. Upper glume apex obtuse.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong, or obovate; 1 length of spikelet; membranous; 4 -veined; sulcate; acute. Fertile lemma ovate; 2.4 mm long; coriaceous; without keel. Lemma surface papillose and striate. Lemma margins involute. 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.