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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 laxa
HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; 100–120 cm long; 4–4.5 mm diam.; woody. Culm-internodes terete; hollow; 7.5–21 cm long. Lateral branches dendroid; erect. Bud complement 1. Branch complement one; solitary. Leaf-sheaths 7.5–10 cm long; glabrous on surface. Leaf-sheath oral hairs setose; 15–20 mm long. Ligule an eciliate membrane; 0.8–1 mm long. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate, or oblong; 15–24.5 cm long; 42–48 mm wide. Leaf-blade venation with distinct cross veins. Leaf-blade margins scabrous. Leaf-blade apex attenuate.
INFLORESCENCE Inflorescence a panicle.
Panicle open; ovate; 30 cm long. Primary panicle branches 3–4 in number; ascending, or spreading, or drooping.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 4 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 35–48 mm long; 3 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 8 mm long.
GLUMES Glumes several; 3 empty glumes; persistent; similar; shorter than spikelet. Upper glume ovate; 13 mm long; membranous; without keels.
FLORETS Fertile lemma ovate; 17–20 mm long; chartaceous; without keel; 9 -veined. Lemma apex acute; awned; 1 -awned. Principal lemma awn 8.5–14.2 mm long overall. Palea 15 mm long. Apical sterile florets resembling fertile though underdeveloped.
FLOWER Lodicules 3; 2.8 mm long. Anthers 3; 10.5 mm long. Stigmas 2.
FRUIT Caryopsis with adherent pericarp.
DISTRIBUTION North America: Mexico.
NOTES Bambuseae. Maekawa 1996.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.