Dimeria dipteros

HABIT Annual. Culms erect, or geniculately ascending; 30–80 cm long. Culm-nodes bearded. Lateral branches lacking. Leaf-sheaths keeled; pilose. Ligule a ciliolate membrane; 0.6 mm long. Leaf-blades 5–12 cm long; 3–5 mm wide. Leaf-blade surface pilose.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 2–3; paired, or digitate; unilateral; 5–8 cm long. Rhachis narrowly winged; flattened; 1 mm wide; ciliate on margins. Rhachis hairs 0.5–1 mm long.

Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels cuneate; flattened; 0.5 mm long; ciliate; hairy above.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets obovate; laterally compressed; compressed strongly; 4.5–5 mm long; falling entire. Spikelet callus pubescent.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume elliptic; 0.9 length of spikelet; coriaceous; 1-keeled; winged on keel; winged broadly; winged all along; 3 -veined. Lower glume surface pubescent. Lower glume margins ciliate. Lower glume apex acute. Upper glume elliptic; coriaceous; 1-keeled; winged on keel; winged all along; 3 -veined. Upper glume surface pubescent. Upper glume margins ciliate. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate; 2.5–3 mm long; hyaline; ciliate on margins. Fertile lemma elliptic; 3.5–4 mm long; without keel; 1 -veined. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 8–10 mm long overall; with twisted column. Column of lemma awn 1.5–2 mm long; glabrous. Palea absent or minute.

FLOWER Anthers 2; 1.5 mm long.

DISTRIBUTION Asia-tropical: Papuasia.

NOTES Andropogoneae. Reeder 1993.

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