GrassBase - The Online World Grass Flora


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

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

Triodia aristiglumis

HABIT Perennial; caespitose; clumped densely. Culms erect; 60 cm long; 3–4 -noded. Culm-internodes smooth, or scaberulous; distally glabrous, or pilose. Leaf-sheaths without exudate; pilose, or hirsute. Ligule a fringe of hairs; 0.8 mm long. Leaf-blades flexuous; conduplicate; 10–25 cm long; 2–3 mm wide; stiff; without exudate. Leaf-blade surface scabrous; rough on both sides; glabrous; hairless except near base. Leaf-blade apex pungent.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; 11–13 cm long; 3–4 cm wide. Primary panicle branches sparsely divided; 3 cm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1–1.5 mm long.

FERTILE SPIKELETS Spikelets comprising 5–6 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 11–13 mm long; 2–3.3 mm wide; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous; obtuse.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 7–8 mm long; 1 length of upper glume; membranous; without keels; 3 -veined. Lower glume surface asperulous; glabrous, or pilose. Lower glume margins ciliate (above). Lower glume apex lobed; 2 -fid; awned; 3 -awned. Lower glume awn 6–7 mm long (laterals 2–3mm). Upper glume lanceolate; 3–8 mm long; 1.2–1.3 length of adjacent fertile lemma; membranous; without keels; 3 -veined. Upper glume surface asperulous; glabrous, or pilose. Upper glume margins ciliate (above). Upper glume apex lobed; 2 -fid; awned; 3 -awned. Upper glume awn 8–9 mm long (laterals 3–4mm).

FLORETS Fertile lemma oblong; 6 mm long; cartilaginous; without keel; 3 -veined, or 9 -veined. Lemma surface scaberulous; pilose; hairy below; hairy in lines. Lemma margins ciliate. Lemma apex lobed; 2 -fid; awned; 3 -awned. Principal lemma awn from a sinus; 12 mm long overall. Lateral lemma awns arising on apex of lobes; 7 mm long; shorter than principal. Palea 5 mm long; membranous; 2 -veined. Palea keels scaberulous. Apical sterile florets 2–3 in number; barren; rudimentary. Apical sterile lemmas awned; 3 -awned.

FLOWER Lodicules 2; fleshy. Anthers 3.

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.