Deyeuxia scabrescens

HABIT Perennial; caespitose. Rhizomes short. Butt sheaths herbaceous, or coriaceous. Culms erect; 60–150 cm long. Lateral branches lacking. Ligule an eciliate membrane; 4–7 mm long; obtuse. Leaf-blades filiform, or linear; flat, or convolute; 20–45 cm long; 2.5–8 mm wide. Leaf-blade surface scaberulous; rough on both sides. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle. Peduncle smooth, or scaberulous above.

Panicle open; lanceolate; dense, or loose; nodding; 10–25 cm long. Primary panicle branches bearing spikelets almost to the base.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4.5–6.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.33 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 4–6 mm long; 0.9 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface scabrous. Lower glume apex acuminate. Upper glume lanceolate; 4.5–6.5 mm long; 1.3 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume surface scabrous. Upper glume apex acuminate.

FLORETS Fertile lemma oblong; 5 mm long; membranous; without keel; 5 -veined. Lemma surface scaberulous; rough above. Lemma apex dentate; 2 -fid; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; geniculate; 5–7 mm long overall; 1–1.5 length of lemma; with twisted column. Palea hyaline; 2 -veined. Rhachilla extension pilose.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-temperate: China. Asia-tropical: India.

NOTES Aveneae. Fl Pak 1993.

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