Fimbribambusa horsfieldii

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms leaning; 700–800 cm long; 8–10 mm diam.; woody; without nodal roots. Culm-internodes terete; hollow. Culm-nodes swollen. Lateral branches dendroid. Leaves cauline. Leaf-sheaths striately veined; glabrous on surface. Leaf-sheath oral hairs scanty. Leaf-sheath auricles falcate; 7 mm long. Ligule an eciliate membrane; truncate. Collar with external ligule. Leaf-blade base cuneate, or broadly rounded; asymmetrical; with a brief petiole-like connection to sheath. Leaf-blades lanceolate, or oblong; 30–35 cm long; 50–90 mm wide. Leaf-blade venation with 18–23 secondary veins. Leaf-blade apex attenuate.

INFLORESCENCE Synflorescence bractiferous; clustered at the nodes; in untidy tufts; open; with glumaceous subtending bracts; with axillary buds at base of spikelet; prophyllate below lateral spikelets; leafless between clusters; on a separate leafless culm.

FERTILE SPIKELETS Spikelets comprising 5–6 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 12–16 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite; curved; 1–2 mm long; glabrous.

GLUMES Glumes two. Upper glume ovate; 3–5 mm long. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 6–7 mm long; without keel. Lemma surface scabrous. Lemma apex acute; mucronate. Palea 1 length of lemma. Palea surface puberulous; hairy on back. Palea apex ciliate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; membranous; glabrous. Anthers 6; 2–3 mm long. Stigmas 3. Ovary umbonate.

DISTRIBUTION Asia-tropical: Malesia.

NOTES Bambuseae. Gamble 1996.

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