Trisetum henryi

HABIT Perennial. Culms robust; 120–160 cm long; 4–5 mm diam.; 8 -noded. Culm-internodes distally glabrous. Leaf-sheaths smooth, or scaberulous; outer margin hairy. Leaf-sheath oral hairs ciliate. Ligule an eciliate membrane. Leaf-blades 15–30 cm long; 8–12 mm wide. Leaf-blade midrib conspicuous. Leaf-blade surface scaberulous; glabrous, or pubescent; sparsely hairy; hairy adaxially. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; dense; 20 cm long; 9 cm wide. Primary panicle branches 3–5 -nate.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes sparsely hairy. Floret callus pubescent.

GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma; shiny; gaping. Lower glume lanceolate; 3 mm long; 0.66 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 5 mm long; 0.9 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scaberulous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 5 mm long; membranous; shiny; keeled; 3 -veined. Lemma surface asperulous. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; geniculate; 6 mm long overall; with twisted column. Palea gaping; 4 mm long; hyaline. Palea keels scaberulous.

FLOWER Anthers 3; 3 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-temperate: China.

NOTES Aveneae. Rendle 1995.

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