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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.
Chusquea angusta
HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; reed-like; 250 cm long; woody. Culm-internodes terete; solid. Lateral branches lacking. Leaf-sheaths 35 cm long; longer than adjacent culm internode. Leaf-sheath oral hairs lacking. Leaf-sheath auricles erect. Ligule an eciliate membrane; 10 mm long; with a secondary abaxial membrane (30mm long). Leaf-blade base with a false petiole (lower leaves); petiole 50 cm long. Leaf-blades lanceolate; 80–165 cm long; 60–65 mm wide; coriaceous.
INFLORESCENCE Inflorescence a panicle.
Panicle open; lanceolate; 75 cm long; 3 cm wide; contracted about primary branches. Primary panicle branches ascending; sparsely divided; 2–4 cm long; bearing spikelets almost to the base. Panicle branches stiff.
Spikelets solitary. Fertile spikelets pedicelled, or sessile.
FERTILE SPIKELETS Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 8–9 mm long; breaking up at maturity; disarticulating below each fertile floret.
GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume ovate; 1–1.5 mm long; 0.5–0.6 length of upper glume; coriaceous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex obtuse. Upper glume ovate; 2–2.5 mm long; 0.5 length of adjacent fertile lemma; coriaceous; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume apex obtuse.
FLORETS Basal sterile florets similar; barren; without significant palea; attached to and deciduous with the fertile. Lemma of lower sterile floret ovate; 4–5.5 mm long; coriaceous; obtuse. Lemma of upper sterile floret 1 length of lower sterile floret. Fertile lemma ovate; 4–5.5 mm long; coriaceous; without keel. Lemma apex acute; awned; 1 -awned. Principal lemma awn 1.5–2 mm long overall. Palea ovate; 1 length of lemma; coriaceous; without keels. Palea apex obtuse.
FLOWER Lodicules 3; ciliate. Anthers 3. Stigmas 2.
FRUIT Caryopsis with adherent pericarp.
DISTRIBUTION South America: northern South America.
NOTES Bambuseae. Fl Guiana 1995.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
