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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 drucei

HABIT Perennial; caespitose; clumped densely. Culms 30–60 cm long. Leaf-sheaths 2–8 cm long; scaberulous, or papillose; glabrous on surface, or puberulous. Ligule a ciliolate membrane; 0.8–1 mm long; erose. Leaf-blades conduplicate; (3–)12–25(–30) cm long; (0.5–)1–4 mm wide; stiff; dark green. Leaf-blade surface scaberulous; rough adaxially, or on both sides. Leaf-blade margins scaberulous.

INFLORESCENCE Inflorescence a panicle. Peduncle glabrous, or pubescent above.

Panicle contracted; lanceolate; interrupted; 5–20 cm long; 1–1.5(–3) cm wide; contracted about primary branches. Primary panicle branches bearing spikelets almost to the base. Panicle axis puberulous. Panicle branches puberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels puberulous.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 6–8 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pilose; with 1–2 mm long hairs. Floret callus pubescent. Floret callus hairs 0.5–1 mm long.

GLUMES Glumes persistent; similar; shorter than spikelet, or reaching apex of florets; thinner than fertile lemma; shiny; gaping. Lower glume oblong, or ovate; 0.75 length of upper glume; membranous; much thinner on margins; 1-keeled. Lower glume apex acute. Upper glume elliptic, or oblong; membranous; with hyaline margins; 1-keeled. Upper glume apex acute.

FLORETS Fertile lemma elliptic; 3.5–6 mm long; membranous; shiny; keeled; 5 -veined. Lemma midvein scaberulous. Lemma surface papillose. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.75 way up back of lemma; curved; 3.5–7.5 mm long overall. Palea gaping; hyaline. Palea keels scaberulous.

FLOWER Lodicules 2; 0.8–1.2 mm long. Anthers 3.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Australasia: New Zealand.

NOTES Aveneae. Edgar 2000.

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