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.

Bambusa pachinensis

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; 200–1000 cm long; 10–60 mm diam.; woody; without nodal roots. Culm-internodes terete; hollow; 10–70 cm long; mid-green; distally glabrous. Culm-nodes swollen. Lateral branches dendroid. Bud complement 1. Branch complement several; in a clump; thinner than stem. Culm-sheaths deciduous; hispid; with dark brown hairs; auriculate; setose on shoulders. Culm-sheath blade triangular. Leaves 5–13 per branch. Leaf-sheaths 4–8 cm long; glabrous on surface. Leaf-sheath oral hairs setose. Leaf-sheath auricles falcate. Ligule an eciliate membrane; truncate, or obtuse. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.2 cm long. Leaf-blades deciduous at the ligule; linear, or lanceolate; 8–20 cm long; 15–25 mm wide. Leaf-blade venation with 10–16 secondary veins. Leaf-blade surface pubescent; densely hairy; hairy abaxially. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Synflorescence bractiferous; clustered at the nodes; in untidy tufts; with spathaceous subtending bracts; with axillary buds at base of spikelet; prophyllate below lateral spikelets; leafless between clusters.

FERTILE SPIKELETS Spikelets comprising 4–5 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 30–40 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite.

GLUMES Glumes two; persistent; similar; shorter than spikelet; similar to fertile lemma in texture. Lower glume ovate; 6 mm long; 7 -veined. Lower glume apex acute. Upper glume ovate; 6 mm long; 7 -veined. Upper glume apex acute.

FLORETS Fertile lemma oblong, or ovate; 11–13 mm long; 9 mm wide; without keel; 17–19 -veined. Lemma surface glabrous. Lemma apex acute. Palea ovate; 9–11 mm long; 15–18 -veined. Palea keels ciliolate. Palea apex acute. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; 4–5 mm long; membranous; ciliate. Anthers 6; 6 mm long. Stigmas 3.

FRUIT Caryopsis with adherent pericarp; ovoid; 6–7 mm long.

DISTRIBUTION Asia-temperate: China and eastern Asia.

NOTES Bambuseae. Lin. 2002.

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