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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Aristida dominii
HABIT Annual; caespitose. Culms erect; 13–50 cm long. Culm-internodes smooth; distally glabrous. Lateral branches lacking, or sparse. Leaf-sheaths smooth, or scaberulous; glabrous on surface. Leaf-sheath oral hairs ciliate; 3 mm long. Ligule a fringe of hairs; 0.3–1 mm long. Leaf-blades flexuous; filiform; involute; 8–16 cm long; 0.5 mm wide. Leaf-blade surface scaberulous, or scabrous; rough abaxially; glabrous, or pilose; hairy adaxially.
INFLORESCENCE Inflorescence a panicle.
Panicle open, or contracted; linear; 12–17 cm long; 1.2 cm wide. Primary panicle branches 2 -nate; 2–3 cm long.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; compressed slightly; 17–21 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 1.5–2 mm long; pubescent; pungent. Floret callus hairs 0.2–1 mm long.
GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 6–10 mm long; 0.4–0.5 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume surface smooth to scabrous. Lower glume apex emarginate, or obtuse; awned; 1 -awned. Lower glume awn 1–2 mm long. Upper glume lanceolate; 17–21 mm long; 2.3–3 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex emarginate, or obtuse; awned; 1 -awned. Upper glume awn 1–2 mm long.
FLORETS Fertile lemma lanceolate; laterally compressed; 5.1–9 mm long; coriaceous; without keel; 3 -veined. Lemma surface scaberulous; rough above. Lemma margins convolute; covering most of palea. Lemma apex acute; awned; 3 -awned. Principal lemma awn 3-branched; spreading; with 38–64 mm long limb; with twisted column; deciduous; abscissing from top of lemma. Column of lemma awn 10–23 mm long; pubescent. Lateral lemma awns 20–41 mm long; shorter than principal. Palea 0.2 length of lemma; without keels.
FLOWER Anthers 3.
FRUIT Caryopsis with adherent pericarp; 4.5–5.5 mm long. Hilum linear; 0.75 length of caryopsis.
DISTRIBUTION Australasia: Australia.
NOTES Aristideae. Simon 1993.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
