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Descriptions

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

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

Triodia burbidgeana

HABIT Perennial; caespitose; clumped loosely. Culms 60–150 cm long. Leaf-sheaths resinous; smooth; glabrous on surface. Leaf-sheath oral hairs ciliate; 4–8 mm long. Ligule a fringe of hairs; 2 mm long. Leaf-blades appressed, or reflexed; 30–60 cm long; 1.3 mm wide; coriaceous; stiff; resinous; aromatic. Leaf-blade surface grooved on either side of midline; grooved abaxially. Leaf-blade margins smooth, or spinulose.

INFLORESCENCE Inflorescence a panicle.

Panicle open; linear; 14–53 cm long; 3–5 cm wide. Primary panicle branches simple, or sparsely divided; 10–17 cm long; naked below. Panicle axis angular. Panicle branches angular, or flat; bearing approximate spikelets, or distant spikelets.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2–11 mm long.

FERTILE SPIKELETS Spikelets comprising 4–8 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed, or subterete; 4–8 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.8 mm long. Floret callus glabrous; truncate.

GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 3.5–5 mm long; 1 length of upper glume; scarious, or cartilaginous; without keels, or 1-keeled; keeled above; 3–5 -veined. Lower glume surface smooth, or asperulous. Lower glume apex emarginate, or obtuse, or acute. Upper glume ovate; 3.5–5 mm long; scarious, or cartilaginous; without keels, or 1-keeled; keeled above; 3 -veined. Upper glume surface smooth, or asperulous. Upper glume apex emarginate, or obtuse, or acute.

FLORETS Fertile lemma ovate, or orbicular; 3–4 mm long; cartilaginous, or coriaceous; much thinner on margins; without keel; 9 -veined. Lemma lateral veins in close groups. Lemma margins scaberulous; eciliate, or ciliolate. Lemma apex lobed; 3 -fid; with simple equal lobes (but midlobe narrower); with triangular lobes; with lobes 0.6 mm long; acuminate. Palea elliptic; cartilaginous. Palea keels winged; narrowly winged; scaberulous. Palea apex entire. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; fleshy. Anthers 3; 2 mm long.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Australasia: Australia.

NOTES Eragrostideae. Lazarides 1996.

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