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Descriptions

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

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

Anisopogon avenaceus

HABIT Perennial; caespitose. Culms 50–100 cm long. Leaves mostly basal. Ligule a ciliolate membrane; 1.5 mm long. Leaf-blades involute; 10–30 cm long; 1–2 mm wide; coriaceous; stiff. Leaf-blade surface ribbed; scabrous; rough adaxially. Leaf-blade apex pungent.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong; effuse; nodding; 15–25 cm long. Panicle branches angular; scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets linear; laterally compressed; 40–50 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 4–6 mm long; pubescent; pungent.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 40–60 mm long; 1 length of upper glume; herbaceous; without keels; 7–11 -veined. Lower glume lateral veins ribbed. Lower glume apex obtuse. Upper glume lanceolate; 40–60 mm long; 2.5–3 length of adjacent fertile lemma; herbaceous; without keels; 7–11 -veined. Upper glume lateral veins ribbed. Upper glume apex obtuse.

FLORETS Fertile lemma linear; subterete; 12–18 mm long; coriaceous; much thinner above; without keel; 7 -veined. Lemma surface pubescent. Lemma margins involute; covering most of palea. Lemma apex lobed; 2 -fid; with linear lobes; incised 0.25 of lemma length; awned; 3 -awned. Principal lemma awn from a sinus; geniculate; 60–75 mm long overall; with twisted column. Lateral lemma awns arising on inner edge of lobes; wrapped around principal; 25–30 mm long; shorter than principal. Palea 1 length of lemma; scarious; thinner above; 2 -veined. Palea keels approximate. Palea apex dentate; 2 -fid. Rhachilla extension 0.5–1 length of fertile floret.

FLOWER Lodicules 3; lanceolate; 2.5–3 mm long; membranous; glabrous; acute. Ovary pubescent all over.

FRUIT Caryopsis with tardily free pericarp.

DISTRIBUTION Australasia: Australia.

NOTES Aveneae. WDC.

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