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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.
Aulonemia longiaristata
HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; erect at the tip, or inclined at the tip; 200–400 cm long; 9–18 mm diam.; woody. Culm-internodes terete; hollow; 30–40 cm long; distally glabrous. Culm-nodes swollen; with distinct supra-nodal ridge. Lateral branches dendroid. Bud complement 1. Branch complement one; solitary. Culm-sheaths 10.5–13 cm long; auriculate; setose on shoulders. Culm-sheath blade lanceolate; reflexed; 4.5–5.5 cm long. Leaf-sheaths keeled; glabrous on surface; outer margin glabrous. Leaf-sheath oral hairs setose; erect; 15–40 mm long. Leaf-sheath auricles falcate. Ligule an eciliate membrane; 0.5–1 mm long. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.4–1.2 cm long. Leaf-blades reflexed; ovate; 14–29 cm long; 35–100 mm wide. Leaf-blade venation without cross veins. Leaf-blade surface smooth, or scabrous; rough abaxially. Leaf-blade apex acuminate.
INFLORESCENCE Inflorescence a panicle.
Panicle open; lanceolate; 14–20 cm long. Panicle branches angular; scabrous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels angular; 10–15 mm long; scabrous.
FERTILE SPIKELETS Spikelets comprising 4–6 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 24–34 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2.5–5 mm long; pubescent. Floret callus evident; 3–5 mm long.
GLUMES Glumes several; 3 empty glumes; persistent; shorter than spikelet; thinner than fertile lemma. Lower glume lanceolate; 5–6 mm long; membranous; without keels; 3 -veined. Lower glume surface pubescent. Lower glume apex acute; awned; 1 -awned. Lower glume awn 1–4 mm long. Upper glume ovate; 11–13 mm long; membranous; without keels; 7–8 -veined. Upper glume surface pubescent. Upper glume apex acuminate; awned; 1 -awned. Upper glume awn 4.5–5.5 mm long.
FLORETS Fertile lemma ovate; 10–20.4 mm long; chartaceous; without keel; 9 -veined. Lemma surface pubescent. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn straight, or curved; 9.5–20 mm long overall. Palea 2.5–11.2 mm long; 4 -veined. Palea surface pubescent. Apical sterile florets resembling fertile though underdeveloped.
FLOWER Lodicules 3. Anthers 3; 5–5.4 mm long. Stigmas 2.
FRUIT Caryopsis with adherent pericarp.
DISTRIBUTION South America: western South America.
NOTES Bambuseae. Clark 1995.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
