GrassBase - The Online World Grass Flora


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

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

Chusquea amistadensis

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; 100–200(–500) cm long; woody; without nodal roots. Culm-internodes terete. Lateral branches dendroid; intravaginal. Branch complement three to several; in a horizontal line; thinner than stem. Culm-sheaths 5–10 cm long; glabrous; without auricles. Culm-sheath blade lanceolate; demarcated but persistent; erect; 1.5–2 cm long; glabrous on surface. Ligule an eciliate membrane; 10–44 mm long. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades deciduous at the ligule; lanceolate; 6–20.5 cm long; 7–14 mm wide. Leaf-blade venation with distinct cross veins. Leaf-blade surface glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; loose; 6–26 cm long. Primary panicle branches appressed. Panicle axis pilose.

Spikelets appressed; solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; curved; subterete; 4.3–7.3 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 0.2–1.6 mm long; 1 length of upper glume; membranous; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume apex obtuse. Upper glume ovate; 0.2–1.6 mm long; 0.05–0.25 length of adjacent fertile lemma; without keels; 0 -veined. Upper glume primary vein absent. 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; 2.4–4.9 mm long; (0.5–)0.66–0.75 length of fertile lemma; chartaceous. Lemma of upper sterile floret ovate; 2.9–5.4 mm long; chartaceous. Fertile lemma ovate; 4.3–6.9 mm long; coriaceous; without keel. Lemma margins involute; covering most of palea. Lemma apex acute, or acuminate. Palea tightly convolute around flower; 1 length of lemma. Palea keels contiguous above a sulcus.

FLOWER Lodicules 3; membranous. Anthers 3. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; apex unappendaged.

DISTRIBUTION South America: Mesoamericana.

NOTES Bambuseae. Fl Meso-Am 1997.

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