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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 jacobsiana
HABIT Perennial; caespitose; clumped densely. Culms 20–60 cm long; 4–6 -noded. Culm-internodes smooth; distally glabrous. Culm-nodes glabrous. Lateral branches lacking, or sparse. Leaf-sheaths longer than adjacent culm internode; smooth; glabrous on surface. Leaf-sheath oral hairs ciliate; 1–2 mm long. Ligule a fringe of hairs; 0.2 mm long. Collar pilose. Leaf-blades filiform, or linear; flat, or conduplicate, or involute, or convolute; 5–12 cm long; 1–2 mm wide. Leaf-blade surface scaberulous; rough abaxially; glabrous. Leaf-blade apex attenuate.
INFLORESCENCE Inflorescence a panicle.
Panicle contracted; linear; continuous, or interrupted; 5–20 cm long; 0.5–2 cm wide. Primary panicle branches appressed; 2 -nate; 1–2.5 cm long. Panicle branches scaberulous, or scabrous.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 6–11 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 0.5–1 mm long; pubescent; acute. Floret callus hairs 0.1–0.3 length of lemma.
GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 3.5–6.5 mm long; 0.5–0.6 length of upper glume; membranous; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute, or acuminate; mucronate. Lower glume awn 1–2 mm long. Upper glume lanceolate; 6–11 mm long; 1.1 length of adjacent fertile lemma; membranous; 1 -veined. Upper glume lateral veins absent. Upper glume apex acute, or acuminate; mucronate. Upper glume awn 0.5–1.5 mm long.
FLORETS Fertile lemma lanceolate; subterete; 5.5–9 mm long; coriaceous; without keel; 3 -veined. Lemma midvein scabrous. Lemma margins convolute; covering most of palea. Lemma apex acute; awned; 3 -awned. Principal lemma awn 3-branched; with 9–18 mm long limb; with a straight or slightly twisted column; persistent. Column of lemma awn 1.5–2 mm long. Lateral lemma awns spreading as much as principal; 9–185 mm long; subequal to principal.
DISTRIBUTION Australasia: Australia.
NOTES Aristideae. Simon & Cowie 2011.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
