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Descriptions

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

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

Dimeria ornithopoda

HABIT Annual. Culms erect; 20–50 cm long. Culm-nodes bearded. Leaf-sheaths keeled; pilose; with tubercle-based hairs. Ligule a ciliolate membrane; 0.5 mm long. Leaf-blades 2–4 cm long; 1–2 mm wide. Leaf-blade midrib prominent beneath. Leaf-blade surface scaberulous; rough on both sides; hirsute; hairy on both sides; with tubercle-based hairs. Leaf-blade margins tuberculate-ciliate. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes; subtended by an inflated leaf-sheath.

Racemes 2(–3); paired; erect, or ascending; unilateral; 3–6 cm long. Rhachis flattened; 0.25–0.3 mm wide; scaberulous on margins; glabrous on margins. Spikelet packing crowded; regular; 2 -rowed.

Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels reduced to a stump; flattened.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; compressed strongly; (1–)2–3(–4.5) mm long; falling entire. Spikelet callus base obtuse.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume linear; 0.8–3 mm long; 0.7–0.8 length of spikelet; chartaceous; much thinner on margins; 1-keeled. Lower glume surface scabrous. Lower glume margins ciliate. Lower glume apex acute. Upper glume elliptic; 1 length of spikelet; chartaceous, or coriaceous; with hyaline margins; without keels; wingless. Upper glume surface scabrous. Upper glume margins ciliate. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate; 0.5–1.5 mm long; hyaline. Fertile lemma elliptic; 0.8–1.8 mm long; hyaline; without keel; 1 -veined. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 4–5 mm long overall; with twisted column. Column of lemma awn 1.5 mm long; glabrous. Palea absent or minute.

FLOWER Anthers 2; 0.25–0.5 mm long.

DISTRIBUTION Asia-temperate: Arabia, China, and eastern Asia. Asia-tropical: India, Indo-China, Malesia, and Papuasia. Australasia: Australia. Pacific: northwestern.

NOTES Andropogoneae. Bor 1993.

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