Dendrocalamus latiflorus Munro

Two cultivars occur in Taiwan: Dendrocalamus latiflorus 'Subconvex' (葫芦麻竹 hu lu ma zhu), distinguished by its much smaller culms, 5–10 m, 4–12 cm in diam., with internodes 10–30 cm, basally congested and pear-shaped; and D. latiflorus 'Mei-nung' (美浓麻竹 mei nong ma zhu), with culms and branches yellow-green with green stripes and culm sheaths yellow-green to brown-green with several narrow, yellow stripes.

Culms 20–25 m, 15–30 cm in diam.; internodes 45–60 cm; wall 1–3 cm thick. Branches several, central branch dominant. Culm sheaths deciduous, thickly leathery; auricles small; ligule 1–3 mm, serrulate; blade reflexed, ovate to lanceolate. Leaf sheaths initially slightly hairy, becoming glabrous; ligule 1–2 mm, serrulate; blade oblong-lanceolate, 15–35(–50) × 2.5–7 cm. Pseudospikelets 1–7 or more per node. Spikelets 12–15 × 7–13 mm; florets 6–8. Glumes 2 or more, ca. 5 mm, margins ciliate; lemma 12–13 × 7–16 mm; palea 7–11 × 3–4 mm. Anthers yellow, 5–6 mm, apex mucronate. Ovary broadly ovoid; style white hairy; stigma 1. Caryopsis 8–12 mm.

Fujian, Guangdong, Guangxi, Guizhou, Hainan, Sichuan, Taiwan, Yunnan; cultivated in SW Jiangsu and S Zhejiang [Myanmar, Vietnam].

Bambusa latiflora (Munro) Kurz; Dendrocalamus lati-florus var. lagenarius W. C. Lin; Sinocalamus latiflorus (Munro) McClure; S. latiflorus var. magnus T. H. Wen.

Perennials, Terrestrial, not aquatic, Rhizomes present, Rhizome short and compact, stems close, Stems woody, Stems nodes swollen or brittle, Stems erect or ascending, Stems caespitose, tufted, or clustered, Stems terete, round in cross section, or polygonal, Stems branching above base or distally at nodes, Stem internodes hollow, Stems with inflorescence 2-6 m tall, Stems with inflorescence 6 m or taller, Stems, culms, or scapes exceeding basal leaves, Leaves mostly cauline, Leaves conspicuously 2-ranked, distichous, Leaves pseudo-petiolate, petiole attached to sheath, Leaves sheathing at base, Leaf sheath mostly open, or loose, Leaf sheath smooth, glabrous, Leaf sheath hairy, hispid or prickly, Leaf sheath and blade differentiated, Leaves borne on branches, Leaf blades lanceolate, Leaf blades ovate, Leaves with distinct crossveins, net-like transverse veins, Leaf blades 2 or more cm wide, Leaf blades mostly flat, Leaf blade with prominently raised or widened midvein, Leaf blades mostly glabrous, Leaf blades scabrous, roughened, or wrinkled, Ligule present, Ligule an unfringed eciliate membrane, Inflorescence lateral or axillary, Inflorescence with 2 or more spikes, fascicles, glomerules, heads, or clusters per culm, Inflorescence single raceme, fascicle or spike, Flowers bisexual, Spikelets sessile or subsessile, Spikelets laterally compressed, Inflorescence or spikelets partially hidden in leaf sheaths, subtended by spatheole, Spikelet 3-10 mm wide, Spikelets with 3-7 florets, Spikelets with 8-40 florets, Spikelets 3 per node, Spikelets all alike and fertille, Spikelets bisexual, Spikelets disarticulating above the glumes, glumes persistent, Spikelets disarticulating beneath or between the florets, Rachilla or pedicel glabrous, Glumes present, empty bracts, Glumes 2 clearly present, Glumes 3-4, Glumes equal or subequal, Glumes shorter than adjacent lemma, Lemmas thin, chartaceous, hyaline, cartilaginous, or membranous, Lemma glabrous, Lemma apex acute or acuminate, Lemma awnless, Lemma margins thin, lying flat, Lemma straight, Palea present, well developed, Palea membranous, hyaline, Palea shorter than lemma, Palea 2 nerved or 2 keeled, Palea keels winged, scabrous, or ciliate, Stamens 6, Styles 1, Styles 2-fid, deeply 2-b ranched, Stigmas 2, Fruit - caryopsis, Caryopsis ellipsoid, longitudinally grooved, hilum long-linear, Caryopsis hairy all over.

Mai xanh hay tre tàu, tên khoa học Dendrocalamus latiflorus, là một loài thực vật có hoa trong họ Hòa thảo. Loài này được Munro mô tả khoa học đầu tiên năm 1868.

麻竹（学名：Dendrocalamus latiflorus），別名大綠竹、巨麻竹、巨竹、甜竹、瓦坭竹、吊絲麻、正坭竹，为禾本科牡竹属的一种，分布於中國華南地區、緬甸和台灣，屬於叢生型竹類。