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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Chusquea cylindrica

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; robust; 150–200 cm long; woody. Culm-internodes terete; hollow. Lateral branches lacking. Leaf-sheaths longer than adjacent culm internode. Ligule a ciliate membrane. Leaf-blade base with a false petiole. Leaf-blades lanceolate; 50–150 cm long; 30–80 mm wide; coriaceous. Leaf-blade margins scabrous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted, or spiciform; lanceolate; 30–80 cm long; contracted about primary branches. Primary panicle branches appressed; bearing spikelets almost to the base. Panicle branches stiff.

Spikelets solitary. Fertile spikelets sessile, or pedicelled.

FERTILE SPIKELETS Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 6 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 2 mm long; 1 length of upper glume; coriaceous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 2 mm long; 0.3–0.4 length of adjacent fertile lemma; coriaceous; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume apex acuminate.

FLORETS Basal sterile florets similar; barren; without significant palea; attached to and deciduous with the fertile. Lemma of lower sterile floret ovate; 3 mm long; 0.5 length of fertile lemma; coriaceous; ciliolate on margins; rostrate. Lemma of upper sterile floret oblong; 4 mm long; 0.66 length of lower sterile floret; coriaceous; ciliolate on margins; acuminate; mucronate. Fertile lemma ovate; 6 mm long; coriaceous; without keel; 5 -veined. Lemma apex acuminate; mucronate. Palea ovate; 1 length of lemma; coriaceous; without keels. Palea apex acute; pubescent.

FLOWER Lodicules 3. Anthers 3. Stigmas 2.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: Caribbean.

NOTES Bambuseae. WDC 1997.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.