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Descriptions

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

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

Chimonobambusa callosa

HABIT Perennial. Rhizomes elongated; leptomorph. Culms erect; 400–700 cm long; 12–25 mm diam.; woody; with root thorns from the nodes. Culm-internodes terete; hollow; 12–25 cm long; grey; smooth. Culm-nodes swollen. Lateral branches dendroid. Culm-sheaths 1 length of internode; chartaceous; pubescent; hairy at the base; hairy on margins; truncate at apex; ciliate on shoulders. Culm-sheath ligule 2 mm high; fimbriate. Culm-sheath blade linear; 1.2–2.5 cm long; pubescent. Leaves cauline. Leaf-sheaths pubescent; hairs tawny; outer margin hairy. Leaf-sheath oral hairs setose. Ligule a ciliolate membrane. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.2–0.7 cm long. Leaf-blades deciduous at the ligule; lanceolate, or oblong; 20–33 cm long; 17–32 mm wide. Leaf-blade midrib conspicuous. Leaf-blade venation with 10–16 secondary veins; with distinct cross veins. Leaf-blade surface scabrous; rough adaxially; pubescent; hairy abaxially. Leaf-blade margins scabrous. Leaf-blade apex acuminate; antrorsely scabrous.

INFLORESCENCE Synflorescence bractiferous; scanty; lax; with glumaceous subtending bracts; without axillary buds at base of spikelet; without prophylls.

Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 6–12 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 50–75 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes flattened; curved; 5 mm long; eventually visible between lemmas; glabrous.

GLUMES Glumes two; persistent; similar; shorter than spikelet. Lower glume oblong; 6–7 mm long; membranous; without keels; 1–3 -veined. Lower glume lateral veins absent, or obscure. Lower glume apex acute. Upper glume oblong; 6–7 mm long; membranous; without keels; 1–3 -veined. Upper glume lateral veins absent, or obscure. Upper glume apex acute.

FLORETS Fertile lemma ovate; 5–9 mm long; membranous; without keel; 3–7 -veined. Lemma margins ciliolate; hairy above. Lemma apex acute; mucronate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; veined; ciliate. Anthers 3. Stigmas 2.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: India.

NOTES Arundinarieae. Gamble 1995.

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