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Descriptions

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

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

Trisetum umbratile

HABIT Perennial; caespitose. Culms 50–90 cm long. Leaf-sheaths mostly shorter than adjacent culm internode; striately veined; glabrous on surface; outer margin hairy. Ligule an eciliate membrane; 2 mm long; lacerate; truncate. Leaf-blades 15–30 cm long; 3–7 mm wide. Leaf-blade surface scabrous; rough on both sides. Leaf-blade margins scabrous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; 10–22 cm long. Panicle axis glabrous. Panicle branches scabrous; rough distally.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1–2 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 4–5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.

GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma; shiny; gaping. Lower glume lanceolate, or oblong; 2.5 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 margins ciliolate. Lower glume apex acute. Upper glume oblong; 4 mm long; 0.9 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume margins ciliolate. Upper glume apex acute.

FLORETS Fertile lemma oblong, or ovate; 4.5 mm long; membranous; keeled; 5 -veined. Lemma surface papillose. Lemma apex dentate; 2 -fid; with lobes 1.5 mm long; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5–0.6 way up back of lemma; straight, or curved; 4–6.5 mm long overall. Palea gaping; 3.5 mm long; hyaline. Palea keels smooth, or scaberulous. Palea surface pubescent; hairy on margins. Palea apex dentate; 2 -fid. Rhachilla extension 1.4 mm long; pilose.

FLOWER Anthers 3; linear; 2 mm long. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-temperate: Soviet far east and China.

NOTES Aveneae. Kitagawa 1996.

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