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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 uniaristata

HABIT Perennial; caespitose; clumped densely. Culms erect; 90–120 cm long; 4 -noded. Culm-internodes scaberulous. Lateral branches ample; arising from lower culm. Leaf-sheaths without exudate; scaberulous. Leaf-sheath auricles erect. Ligule a fringe of hairs; 1 mm long. Leaf-blades filiform; conduplicate; 20–40 cm long; 1–2 mm wide; stiff; without exudate. Leaf-blade surface scabrous; rough adaxially. Leaf-blade apex pungent.

INFLORESCENCE Inflorescence a panicle.

Panicle open; linear; 15–30 cm long; 2–5 cm wide. Primary panicle branches 11 cm long. Panicle axis scabrous. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 3 mm long.

FERTILE SPIKELETS Spikelets comprising 4 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 4.5–5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1 mm long. Floret callus glabrous; obtuse; disarticulating obliquely.

GLUMES Glumes persistent; similar; exceeding apex of florets. Lower glume lanceolate; 4.5–5 mm long; 1 length of upper glume; membranous, or cartilaginous; without keels; 3–5 -veined. Lower glume surface asperulous. Lower glume apex lobed; 2 -fid; awned; 1 -awned. Lower glume awn 0.6–0.8 mm long. Upper glume lanceolate; 4.5–5 mm long; 1.1 length of adjacent fertile lemma; membranous, or cartilaginous; without keels; 3–5 -veined. Upper glume surface asperulous; rough above. Upper glume apex lobed; 2 -fid; awned; 1 -awned. Upper glume awn 1.5 mm long.

FLORETS Fertile lemma oblong; 4 mm long; membranous; without keel; 3 -veined. Lemma midvein ciliate; hairy below. Lemma surface scaberulous; rough above. Lemma margins ciliate; hairy below. Lemma apex lobed; 2 -fid; with lobes 1 mm long; awned; 1 -awned. Principal lemma awn from a sinus; curved; flat below; 13 mm long overall. Palea membranous; 2 -veined. Palea keels winged; narrowly winged; scaberulous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; fleshy. Anthers 3; 1.8 mm long; purple.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Australasia: Australia.

NOTES Eragrostideae. Lazarides.

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