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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.
HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; 2000–3000 cm long; 100–130 mm diam.; woody; with root thorns from the nodes. Culm-internodes terete; thin-walled; 20 cm long. Lateral branches dendroid. Branch complement three; with 1 branch dominant; thinner than stem. Culm-sheaths pubescent; hairy throughout; with dark brown hairs; without auricles. Culm-sheath blade triangular; erect; pubescent. Leaf-sheath oral hairs lacking. Ligule a ciliolate membrane. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath; petiole glabrous. Leaf-blades lanceolate, or oblong; 10–20 cm long; 6–12 mm wide. Leaf-blade venation without cross veins.
INFLORESCENCE Synflorescence bractiferous; scanty; 5–10 cm long; lax; with glumaceous subtending bracts; with axillary buds at base of spikelet; prophyllate below lateral spikelets.
Fertile spikelets sessile.
FERTILE SPIKELETS Spikelets comprising 6–12 fertile florets; with diminished florets at the apex. Spikelets linear; straight, or curved; laterally compressed; 30–60 mm long; 4–5 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes obscured by lemmas.
GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume ovate; 0.5–0.8 length of upper glume; coriaceous; without keels; 11–17 -veined. Lower glume apex obtuse, or acute. Upper glume ovate; 0.5–0.8 length of adjacent fertile lemma; coriaceous; without keels; 11–17 -veined. Upper glume apex obtuse, or acute.
FLORETS Fertile lemma ovate; 8–16 mm long; coriaceous; without keel; 11–17 -veined. Lemma apex acute. Palea 1 length of lemma; 6 -veined. Palea keels winged; conspicuously winged. Palea surface pubescent; hairy on back. Apical sterile florets resembling fertile though underdeveloped.
FLOWER Lodicules 3. Anthers 6. Stigmas 3. Ovary umbonate.
FRUIT Caryopsis with adherent pericarp.
DISTRIBUTION North America: Mexico. South America: Mesoamericana, northern South America, western South America, Brazil, and southern South America.
NOTES Bambuseae. Fl Cat.
Please cite this publication as detailed in How to Cite Version: 16th November 2012.