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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 schumannii

HABIT Perennial; caespitose. Culms erect, or geniculately ascending; 70–80 cm long. Culm-nodes bearded. Leaf-sheaths keeled; pilose; with tubercle-based hairs; outer margin hairy. Ligule an eciliate membrane; 2 mm long. Leaf-blades 5–14 cm long; 3–4 mm wide. Leaf-blade surface pilose; with tubercle-based hairs. Leaf-blade margins tuberculate-ciliate. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; arcuate; unilateral; 6–10 cm long. Rhachis broadly winged; 6 mm wide; glabrous on surface; tuberculate on margins; ciliate on margins; terminating in a barren extension; extension flattened. Rhachis hairs yellow. 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; acute; 3 mm long; 0.9 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; hyaline; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume apex truncate. Upper glume elliptic; 0.25–0.33 length of spikelet; membranous; without keels; 0 -veined. Upper glume primary vein absent. Upper glume lateral veins absent. Upper glume apex emarginate.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret elliptic, or oblong; 1 length of spikelet; coriaceous; sulcate and readily splitting into two halves; smooth, or scaberulous; rough above; acute. Palea of lower sterile floret membranous. Fertile lemma elliptic; 2.7 mm long; coriaceous; without keel. Lemma surface papillose and striate. Lemma margins involute. Lemma apex acute; pubescent. Palea coriaceous.

FLOWER Lodicules 2; fleshy; truncate. Anthers 3.

DISTRIBUTION South America: Brazil.

NOTES Paniceae. Burman 1993.

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