Guadua trinii

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms leaning; 300–1000 cm long; 30–50 mm diam.; woody; with root thorns from the nodes. Culm-internodes semiterete; with small lumen; antrorsely scabrous. Lateral branches dendroid. Bud complement 1. Branch complement three; thinner than stem. Culm-sheaths deciduous. Culm-sheath blade inconspicuous. Leaf-sheath oral hairs setose. Ligule an eciliate membrane. Leaf-blade base with a brief petiole-like connection to sheath; petiole pubescent. Leaf-blades deciduous at the ligule; lanceolate; 5–15 cm long; 15–30 mm wide. Leaf-blade apex acuminate.

INFLORESCENCE Synflorescence bractiferous; scanty; lax; with glumaceous subtending bracts; with axillary buds at base of spikelet; prophyllate below lateral spikelets.

Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 6–8 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 20–30 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes obscured by lemmas.

GLUMES Glumes several; persistent; similar; shorter than spikelet. Upper glume ovate; coriaceous; without keels; 11–17 -veined. Upper glume apex acute.

FLORETS Fertile lemma ovate; 10 mm long; coriaceous; without keel; 11–17 -veined. Lemma apex acute. Palea keels winged; conspicuously winged. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; veined. Anthers 6. Stigmas 3.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: Brazil and southern South America.

NOTES Bambuseae. Fl Entre Rios 1995.

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