Leptocanna Chia et H. L. Fung

Abstract

Small arborescent bamboos. Rhizomes sympodium. Culms caespitose, erect at the base, the middle and upper parts pendulous and scrambling; internodes terete, rather long, scabrous on the surface due to the silica, culm walls quite thin; sheath nodes prominent because of the residues of culm sheaths; culm nodes flat. Culm bud one. Branches many, clustered, subequal. Culm sheaths tardily deciduous, shorter than the internodes, trapezoidal, leathery, abaxially covered with silica; auricles narrowly linear, oral setae absent; ligules short; blades linear-triangular, erect. Branchlets with a few leaves; leaf auricles absent; ligules truncate, short; blades large, round or broadly cuneate, transverse veins obvious. Secondary branches of the flowering branchlets subtended by aristate and basally amplexicaul bracts; tip of pseudospikelets gradually acuminate; prophyll linear-lanceolate, 2-keeled, the keels ciliate, the apex with dense cilia bundles; spikelets fusiform, fertile floret one; the rachilla disarticulated under the second glume and the sterile lemma and extending behind the fertile floret as awn-shaped with one floret on the top; glumes 2, same size or the first one shorter; sterile lemma 1, apex acute, fertile lemma with truncate apex or a short acumination; palea apex obtuse, shortly hispid in the middle groove near the adaxial top; lodicules 3; stamens 6, filaments free; ovary nearly clavate, style 1, stigmas 2, plumose. New shoots in autumn.