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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 stricta

HABIT Perennial; caespitose. Culms erect, or geniculately ascending; 70–90 cm long. Culm-nodes glabrous. Leaf-sheaths keeled. Ligule an eciliate membrane; 1.5 mm long. Leaf-blades flat, or conduplicate; 10–15 cm long; 1–2 mm wide. Leaf-blade surface smooth, or scaberulous; rough abaxially; glabrous. Leaf-blade margins glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; arcuate; unilateral; 10 cm long. Rhachis broadly 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. 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 mm long; 0.6 mm wide; falling entire.

GLUMES Glumes dissimilar; shorter than spikelet; thinner than fertile lemma. Lower glume oblate; 0.2 mm long; 0.07 length of spikelet; membranous; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume apex truncate. Upper glume lanceolate; 1–1.5 mm long; 0.33–0.5 length of spikelet; membranous; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume apex attenuate.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret elliptic, or oblong; 2.9 mm long; 1.2 length of fertile lemma; 1 length of spikelet; coriaceous; sulcate and readily splitting into two halves; ciliate on margins (above); bearing white hairs; acute. Palea of lower sterile floret becoming indurate on flanks at maturity. Fertile lemma elliptic, or oblong; 2 mm long; coriaceous; without keel. Lemma surface papillose and striate; with conspicuous apical hairs. 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.