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Descriptions

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

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

Aristida behriana

HABIT Perennial; caespitose. Culms 22–43 cm long; 1 -noded. Culm-internodes antrorsely scabrous; distally glabrous. Lateral branches lacking. Leaf-sheaths scaberulous. Leaf-sheath oral hairs ciliate. Ligule a fringe of hairs; 0.3 mm long. Collar pubescent. Leaf-blades 10–25 cm long; 2–3 mm wide. Leaf-blade surface scabrous; rough adaxially.

INFLORESCENCE Inflorescence a panicle. Peduncle terete.

Panicle contracted; linear; 8–13.5 cm long. Primary panicle branches 0.4–0.8 cm long; bearing spikelets almost to the base. Panicle branches scaberulous, or scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 15–19.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 0.7–1 mm long; pubescent; acute.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 7–11.6 mm long; 0.5–0.6 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acuminate; awned; 1 -awned. Lower glume awn 0.2–0.5 mm long. Upper glume lanceolate; 15–19 mm long; 1.6–2.1 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex acute, or acuminate; awned; 1 -awned. Upper glume awn 1–2.5 mm long.

FLORETS Fertile lemma lanceolate; subterete; 7–12 mm long; coriaceous; without keel; 3 -veined. Lemma margins convolute; covering most of palea. Lemma apex acute; awned; 3 -awned. Principal lemma awn spreading; flat below; with 16–66 mm long limb; without a column; persistent. Lateral lemma awns 13–53 mm long; subequal to principal. Palea 0.2 length of lemma; without keels.

FLOWER Anthers 3; 1.1–1.4 mm long.

FRUIT Caryopsis with adherent pericarp; 6.6–8 mm long. Hilum linear; 0.5 length of caryopsis.

DISTRIBUTION Australasia: Australia.

NOTES Aristideae. Simon 1993.

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