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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 triticoides

HABIT Perennial; caespitose; clumped densely. Culms 60–90 cm long. Culm-internodes distally pubescent. Leaf-sheaths without keel; indistinctly veined, or striately veined; puberulous. Leaf-sheath oral hairs ciliate. Ligule a fringe of hairs. Leaf-blades aciculate; conduplicate; 5–10 cm long; stiff; light green. Leaf-blade venation without layer of subepidermal sclerenchyma masking vein striation. Leaf-blade surface glabrous. Leaf-blade apex pungent.

INFLORESCENCE Inflorescence composed of racemes.

Racemes borne along a central axis; appressed; unilateral; 4–7 cm long; bearing 14–18 fertile spikelets on each. Central inflorescence axis 20–40 cm long. Spikelet packing regular; 2 -rowed.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 7–10 fertile florets; with diminished florets at the apex. Spikelets lanceolate, or ovate; laterally compressed; compressed slightly; 7–8 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma. Lower glume oblong; symmetrical, or asymmetrical; 4–4.5 mm long; 1 length of upper glume; coriaceous; without keels; 3–5 -veined. Lower glume lateral veins obscure. Lower glume apex acute; mucronate. Upper glume oblong; 4–4.5 mm long; 1 length of adjacent fertile lemma; coriaceous; without keels; 3–5 -veined. Upper glume primary vein conspicuous. Upper glume lateral veins obscure. Upper glume apex acute; mucronate.

FLORETS Fertile lemma lanceolate, or ovate; 4–5 mm long; coriaceous; without keel; 3 -veined. Lemma midvein pubescent; hairy below. Lemma margins pubescent; hairy below. Lemma apex lobed; 3 -fid; with outer lobes longer; incised 0.25 of lemma length. Palea elliptic; 1 length of lemma. Palea keels winged; narrowly winged. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3.

DISTRIBUTION Australasia: Australia.

NOTES Eragrostideae. Burbidge 1993.

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