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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 mosquitiensis

HABIT Perennial; caespitose. Culms erect, or geniculately ascending, or decumbent; 65–110 cm long; without nodal roots, or rooting from lower nodes. Culm-internodes distally pubescent. Culm-nodes bearded. Leaf-sheaths glabrous on surface, or puberulous. Ligule an eciliate membrane; 1.5–2.4 mm long. Leaf-blades 16–32 cm long; 9–16 mm wide. Leaf-blade surface glabrous, or puberulous; hairy adaxially.

INFLORESCENCE Inflorescence composed of racemes. Peduncle glabrous, or pubescent above.

Racemes 1; single; unilateral; 1–16 cm long. Rhachis narrowly winged; folded longitudinally to embrace spikelets; 2–2.8 mm wide; glabrous on surface; scaberulous on margins; terminating in a spikelet. 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; 1.8–3 mm long; puberulous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; acute; 3.4–4 mm long; 1.4–1.8 mm wide; falling entire.

GLUMES Glumes dissimilar; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 0.6–2.5 mm long; 0.2–0.66 length of spikelet; hyaline; without keels; 0–1 -veined. Lower glume lateral veins absent. Lower glume apex obtuse; muticous, or awned; 1 -awned. Lower glume awn 0.7–1.2 mm long. Upper glume elliptic; 2.8–3.4 mm long; 0.75 length of spikelet; chartaceous; without keels; 5(–7) -veined. Upper glume apex acute.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret elliptic; 1 length of spikelet; coriaceous; sulcate and readily splitting into two halves; acute. Palea of lower sterile floret becoming indurate on flanks at maturity. Fertile lemma elliptic; 3–3.6 mm long; coriaceous; without keel. Lemma margins involute. Lemma apex acute; pubescent. Palea coriaceous.

FLOWER Anthers 3; 1.3–1.9 mm long; purple.

DISTRIBUTION South America: Mesoamericana.

NOTES Paniceae. Fl Meso-Am 1995.

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