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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 barbata

HABIT Perennial; caespitose; clumped densely. Culms 80–120 cm long. Culm-internodes scaberulous. Leaf-sheaths without exudate; smooth, or antrorsely scabrous; pilose. Leaf-sheath oral hairs ciliate; 2.5 mm long. Leaf-sheath auricles absent. Ligule a fringe of hairs. Leaf-blade base with a false petiole; petiole 1.2–1.8 cm long. Leaf-blades aciculate; conduplicate; 25–60 cm long; 0.7–1.1 mm wide; stiff; without exudate. Leaf-blade surface glabrous.

INFLORESCENCE Inflorescence composed of racemes.

Racemes borne along a central axis; unilateral; 10–13 cm long. Central inflorescence axis 27–55 cm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.8–5.5 mm long.

FERTILE SPIKELETS Spikelets comprising 4–6 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 3.5–4.5 mm long; 2.5–4 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.25 mm long. Floret callus evident; 0.2 mm long; pilose. Floret callus hairs 1–1.3 mm long.

GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 2.7–3.5 mm long; 1 length of upper glume; scarious, or cartilaginous; without keels; 3 -veined. Lower glume surface asperulous. Lower glume apex obtuse; mucronate. Upper glume ovate; 2.7–3.5 mm long; 0.75 length of adjacent fertile lemma; scarious, or cartilaginous; without keels; 3 -veined. Upper glume surface asperulous. Upper glume apex obtuse; mucronate.

FLORETS Fertile lemma ovate; 3.2–4 mm long; cartilaginous, or coriaceous; without keel; 9 -veined. Lemma lateral veins in close groups (of 3). Lemma surface hirsute; hairy below. Lemma apex lobed; 3 -fid; with lobes 0.9–1.2 mm long; incised 0.25 of lemma length. Palea lanceolate; 3 mm long; 2-keeled. Palea keels thickened; wingless; ciliolate. Palea surface puberulous; hairy above. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3; 1.7 mm long.

DISTRIBUTION Australasia: Australia.

NOTES Eragrostideae. Barrett 2011.

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