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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 rigidula

HABIT Perennial. Rhizomes elongated; leptomorph. Culms erect; 200–600 cm long; 15–30 mm diam.; woody; without nodal roots. Culm-internodes terete, or quadrangular; with small lumen; 10–24 cm long; smooth; distally glabrous. Culm-nodes flush with internodes; glabrous. Lateral branches dendroid. Branch complement three; in a horizontal line; with subequal branches; thinner than stem. Culm-sheaths deciduous; chartaceous, or coriaceous; glabrous, or hispid; with tawny hairs; hairy on margins; without auricles; glabrous on shoulders. Culm-sheath ligule entire. Culm-sheath blade linear; deciduous; erect. Leaves cauline; 1–3 per branch. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs lacking. Ligule an eciliate membrane; truncate. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades deciduous at the ligule; lanceolate; 7–13 cm long; 8–17 mm wide. Leaf-blade venation with 6–8 secondary veins; with distinct cross veins. Leaf-blade surface glabrous.

INFLORESCENCE Synflorescence bractiferous; paniculate; with glumaceous subtending bracts; with axillary buds at base of spikelet.

Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 3–6 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 17–25 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes several; 4–5 empty glumes; persistent; similar; shorter than spikelet. Lower glume lanceolate; membranous; without keels. Lower glume apex acute. Upper glume lanceolate; 3–6 mm long; membranous; without keels; 7–11 -veined. Upper glume apex acute.

FLORETS Fertile lemma oblong; 8–14 mm long; chartaceous; without keel; 9–13 -veined. Lemma apex acute. Palea 7–12 mm long. Palea apex obtuse. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; 1.5–3 mm long; membranous; ciliate. Anthers 3; 5–7 mm long; purple. Stigmas 2.

FRUIT Caryopsis with fleshy pericarp; oblong; 8–11 mm long. Endosperm evanescent.

DISTRIBUTION Asia-temperate: China.

NOTES Arundinarieae. Wen 1996.

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