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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 bynoei

HABIT Perennial; caespitose. Culms erect, or geniculately ascending; 90–165 cm long; 3–4 -noded. Leaf-sheaths resinous; outer margin hairy. Leaf-sheath oral hairs bearded. Ligule a fringe of hairs. Leaf-blades curled; conduplicate; 30–45 cm long; stiff; resinous; aromatic. Leaf-blade surface puberulous. Leaf-blade apex pungent.

INFLORESCENCE Inflorescence composed of racemes.

Racemes numerous; borne along a central axis; unilateral; 5–11 cm long. Central inflorescence axis 30–50 cm long. Rhachis angular; scabrous on margins. Spikelet packing broadside to rhachis; 2 -rowed.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.9–2 mm long.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 4.4–9.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.8–1.5 mm long. Floret callus pubescent.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 4.4–9.5 mm long; 1.3 length of upper glume; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex entire, or dentate; 2 -fid; acuminate; mucronate. Upper glume lanceolate; 3.3–7 mm long; 2–3 length of adjacent fertile lemma; membranous; without keels; 3 -veined. Upper glume apex entire, or dentate; 2 -fid; acuminate; mucronate.

FLORETS Fertile lemma oblong; 1.6–2.3 mm long; membranous; without keel; 3–5 -veined. Lemma surface scaberulous; rough above; pubescent; hairy below. Lemma apex lobed; 3 -fid; with linear lobes; incised 0.2 of lemma length; awned; 1 -awned, or 3 -awned. Principal lemma awn 3.5–6 mm long overall. Lateral lemma awns arising on apex of lobes; 0–3 mm long; shorter than principal. Palea oblong; membranous; 2 -veined. Palea keels scaberulous; adorned above. Palea surface pubescent; hairy on back. Palea apex dentate; 2 -fid. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; fleshy. Anthers 3; 1–1.7 mm long.

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.