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Descriptions

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

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

Sinobambusa tootsik

HABIT Perennial; culms solitary. Rhizomes elongated; leptomorph. Culms erect; 500–1000 cm long; 20–40 mm diam.; woody; without nodal roots. Culm-internodes channelled; hollow; 40–80 cm long. Culm-nodes swollen; pubescent (brown hairs). Lateral branches dendroid. Branch complement three; in a horizontal line; with subequal branches; thinner than stem. Culm-sheaths deciduous; coriaceous; concolorous; pilose; hairy throughout; with dark brown hairs; auriculate; setose on shoulders. Culm-sheath blade lanceolate; acute. Leaves cauline; 3–9 per branch. Leaf-sheath oral hairs setose; spreading; dark. Leaf-sheath auricles falcate. Ligule an eciliate membrane. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate, or oblong; 8–20 cm long; 10–30 mm wide. Leaf-blade venation with distinct cross veins. Leaf-blade margins spinulose.

INFLORESCENCE Synflorescence bractiferous; fasciculate; lax; with glumaceous subtending bracts; with axillary buds at base of spikelet; prophyllate below lateral spikelets.

Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 4–25 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 30–100 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume oblong; 0.7–1 length of upper glume; chartaceous; without keels; 9 -veined. Lower glume apex acute. Upper glume oblong; 0.5–0.7 length of adjacent fertile lemma; chartaceous; without keels; 9 -veined. Upper glume lateral veins with cross-veins. Upper glume apex acute.

FLORETS Fertile lemma ovate; 8–11 mm long; chartaceous; without keel; 11–15 -veined. Lemma lateral veins with cross-veins. Lemma apex acute. Palea 0.9 length of lemma; chartaceous; 9 -veined. Palea keels ciliate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; obovate; 2.5 mm long; glabrous. Anthers 3; 4.5 mm long. Stigmas 3. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; ellipsoid; 9 mm long.

DISTRIBUTION Asia-temperate: China and eastern Asia.

NOTES Arundinarieae. Lin.

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