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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 pachystachys

HABIT Perennial. Rhizomes elongated; leptomorph. Culms erect; 300–600 cm long; 10–30 mm diam.; woody; with root thorns from the nodes. Culm-internodes quadrangular; with small lumen; 15–22 cm long; smooth; distally hispid. Culm-nodes swollen; pubescent. Lateral branches dendroid. Branch complement three; in a horizontal line; with subequal branches; thinner than stem. Culm-sheaths tardily deciduous; chartaceous; green and white; distinctly mottled with last colour; hispid; with tawny hairs; without auricles; glabrous on shoulders. Culm-sheath ligule entire. Culm-sheath blade linear; demarcated but persistent; erect; 0.3–0.4 cm long. Leaves cauline; 1–3 per branch. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs scanty. 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; 10–18 cm long; 11–21 mm wide. Leaf-blade venation with 8–12 secondary veins; with distinct cross veins. Leaf-blade apex acuminate.

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

Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 4–6 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes several; 3 empty glumes; persistent; similar; shorter than spikelet. Lower glume lanceolate; membranous; without keels. Lower glume apex acute. Upper glume lanceolate; membranous; without keels. Upper glume apex acute.

FLORETS Fertile lemma oblong; chartaceous; without keel; 5–7 -veined. Lemma lateral veins with cross-veins. Lemma surface glabrous, or puberulous. Lemma apex apiculate. Palea 1 length of lemma. Apical sterile florets resembling fertile though underdeveloped.

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

FRUIT Caryopsis with fleshy pericarp; oblong. Endosperm evanescent.

DISTRIBUTION Asia-temperate: China.

NOTES Arundinarieae. Wen 1996.

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