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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 longicollis

HABIT Perennial; caespitose. Culms 50–80 cm long; 3 -noded. Culm-internodes glaucous; scaberulous; distally glabrous. Lateral branches ample. Leaf-sheaths striately veined; scaberulous; glabrous on surface. Leaf-sheath oral hairs pubescent, or ciliate. Ligule a fringe of hairs; 0.5–1 mm long. Collar pilose. Leaf-blades involute; 9–18 cm long; 2–3 mm wide. Leaf-blade surface pubescent; hairy adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; elliptic; 9.5–20 cm long; 3–6 cm wide. Primary panicle branches 0.5–1.7 cm long; bearing spikelets almost to the base.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 7–13 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 0.8 mm long; pubescent; acute.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 5–11 mm long; 0.7–0.8 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface asperulous, or scabrous. Lower glume apex acuminate to setaceously attenuate. Upper glume lanceolate; 7–13 mm long; 1.4 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex acuminate to setaceously attenuate.

FLORETS Fertile lemma lanceolate; subterete; 5–9.5 mm long; coriaceous; without keel; 3 -veined. Lemma surface tuberculate; rough above. Lemma margins convolute; covering most of palea. Lemma apex acute; awned; 3 -awned. Principal lemma awn 3-branched; spreading; with 15–25 mm long limb; with a straight or slightly twisted column; persistent. Column of lemma awn 1–5 mm long. Lateral lemma awns spreading as much as principal; 15–25 mm long; subequal to principal. Palea 0.2 length of lemma; without keels.

FLOWER Anthers 3.

FRUIT Caryopsis with adherent pericarp; 4–6.5 mm long. Hilum linear; 0.25 length of caryopsis.

DISTRIBUTION Australasia: Australia.

NOTES Aristideae. Simon 1993.

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