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Descriptions

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

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

Thuarea involuta

HABIT Perennial. Culms prostrate; 5–10 cm long; rooting from lower nodes. Leaf-sheaths pubescent. Ligule a fringe of hairs. Leaf-blades lanceolate; 1.5–5 cm long; 3–10 mm wide. Leaf-blade surface pubescent. Leaf-blade margins scaberulous.

INFLORESCENCE Inflorescence composed of racemes; deciduous as a whole; subtended by sheathless blades; enclosed. Peduncle terete (5mm long); widened at apex; disarticulating; disarticulating above uppermost sheath; base blunt.

Racemes 1; single; erect; lanceolate; unilateral; 1–1.5 cm long; bearing few fertile spikelets; bearing 1(–2) fertile spikelets on each. Rhachis broadly winged; foliaceous; folded transversely to form a capsule; puberulous on surface; terminating in a sterile spikelet. Spikelet packing adaxial; regular; 1 -rowed.

Spikelets solitary. Fertile spikelets sessile.

STERILE SPIKELETS Apical sterile spikelets male (deciduous); 4–6 in number; 4 mm long.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 5.3 mm long; falling entire; deciduous with accessory branch structures.

GLUMES Glumes one the lower absent or obscure; exceeding apex of florets; thinner than fertile lemma. Upper glume ovate; 5.3 mm long; membranous; without keels; 5–7 -veined. Upper glume surface pubescent. Upper glume margins ciliate. Upper glume apex acute.

FLORETS Basal sterile florets male, or barren; with palea. Lemma of lower sterile floret similar to upper glume; ovate; 4.8 mm long; 0.9 length of spikelet; membranous; 5 -veined; pubescent; ciliate on margins; acute. Palea of lower sterile floret pilose. Fertile lemma ovate; 4.4 mm long; indurate; without keel; 5 -veined. Lemma apex acute. Palea indurate.

FLOWER Anthers 3; 2.2 mm long.

DISTRIBUTION Africa: western Indian ocean. Asia-temperate: China and eastern Asia. Asia-tropical: India, Indo-China, Malesia, and Papuasia. Australasia: Australia. Pacific: southwestern, south-central, northwestern, and north-central.

NOTES Paniceae. WDC.

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