Deyeuxia srilankensis

HABIT Perennial; caespitose. Culms erect; 35–70 cm long. Culm-nodes glabrous. Lateral branches lacking. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 2–3.5 mm long; scaberulous on abaxial surface. Leaf-blades 4–8 cm long; 2–4 mm wide. Leaf-blade surface scaberulous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; elliptic, or ovate; 5–13 cm long; 2–3.5 cm wide. Primary panicle branches spreading; whorled at lower nodes; 3–6 cm long. Panicle branches smooth, or scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 3–7 mm long.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 2.7–3.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 0.6–1.5 mm long.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 2.7–3.5 mm long; 1.1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 2.5–3 mm long; 1.1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acuminate.

FLORETS Fertile lemma elliptic, or ovate; 2.1–2.8 mm long; membranous; without keel; 5(–7) -veined. Lemma apex dentate; emarginate, or truncate; muticous, or awned; 1 -awned. Principal lemma awn dorsal; arising 0.33 way up back of lemma; 1–2 mm long overall; not or scarcely exserted from spikelet. Palea 1.8–2.3 mm long; hyaline; 2 -veined. Rhachilla extension 0.3–0.7 mm long; pilose; with 0.6–1.5 mm long hairs.

FLOWER Lodicules 2. Anthers 3; 1–1.3 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; oblong; 1.3 mm long. Hilum punctiform.

DISTRIBUTION Asia-tropical: India.

NOTES Aveneae. Fl Ceyl 1993.

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