Schizostachyum nghianum N.H.Xia, V.T.Tran, 2013

Schizostachyum nghianum N.H.Xia, V.T.Tran View in CoL , sp. nov. — Fig. 1 View Fig

Species nova habitu S. funghomio McClure , S. pseudolimae McClure similis, sed vaginis culmorum apicis truncatis, bracteis unicis, lemmatibus ca 1 mm

1 Key Laboratory of Plant Resources and Sustainable Utilization/ Guangdong Provincial Key Laboratory of Digital Botanical Garden,South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China.

2 The Graduate School of the Chinese Academy of Science , 19 A Yuquanly, Beijing, 100049, China .

3 Forest Science Institute of Vietnam,Dong Ngac,Tu Liem, Hanoi, Vietnam.

* Corresponding authors e-mail:nhxia@scbg.ac.cn, tvtien117@yahoo.com. mucronatis, paleis apicibus integris, filamentis liberis differt. — Typus: H. N. Nguyen 1200904712 (holo FSIV;iso IBSC), Vietnam, Tuyen Quang Province, Chiem Hoa District, Trung Ha Commune , elevation 300 m asl, N22°13'943", E105°10'513", lowland, 12 December 2009 .

Etymology. The new species is named in honour of Dr. Nguyen Hoang

Nghia, for his contributions to the bamboo research in Vietnam.

Sympodial bamboo. Culms erect, 8–12 m tall, 5–6 cm diam, apically suberect; internodes terete, straight, 50–70 cm long, densely covered with appressed white hairs when young and white powdery, becoming rough later; wall 0.3–0.5 cm thick; nodes slightly swollen with a ring of white powder 1.5 cm high below each node. Branches numerous on each node, slender, subequal, 30–50 cm long. Culm sheaths tardily deciduous, 20– 22 cm high, straw-colored, abaxially white powdery, with stiff, brown hairs, margins ciliate, apex truncate; auricles inconspicuous; oral setae many, c. 3 mm long; ligule subtruncate, short, 1–2 mm high, margin lobed, with fimbriae 3–5 mm long; blade reflexed, linear-lanceolate, less than 1/2 the length of the sheath, adaxially hairy at base, abaxially glabrous, apex acuminate. Leaves 4–6 per ultimate branch; sheaths often white powdery; auricles inconspicuous; oral setae numerous, 5–6 mm long; petiole 0.4–0.5 cm long, 0.1 cm thick; blades oblong-lanceolate or ovate-lanceolate, 20–25 by 3.5–4.5 cm, lower surface fine-hairy, base acute, slightly oblique, apex long acuminate. Pseudospikelets, c. 3 cm long, white villous; prophylls oblong-obovate, 5–6 mm long, papery, apex obtuse, 2-keeled, ciliate; bract 1, oblong, 0.6–1.5 cm long, papery, many-veined, apex obtuse to acute and mucronate, margin ciliate; floret 1, fertile; rachilla disarticulating below the floret; the extension of the rachilla nearly as long as the palea with the terminal rudimentary floret conspicuous; glumes absent. Lemma oblong-lanceolate, 1.5–1.6 cm long, sparse whiteciliate towards apex, strongly convolute, many-veined, apex scabrous, mucronate, mucro c. 1 mm long; palea c. 2.6 cm long, base spirally convolute, papery, 2-keeled toward the apex, apex not bifid (fertile floret), keels apically ciliate, the two sides outside the keels equal in width; lodicules absent; stamens 6, filaments free, anthers white-yellow, c. 1 cm long; stigmas 3, pink, plumose. Fruit unknown.

Distribution — Trung Hoa Commune, Chiem Hoa District, Tuyen Quang Province, northern Vietnam.

Habitat — The species grows within degraded valleys and mountain gorges at elevation of 300 m asl. Stands were found

© 2013 Nationaal Herbarium Nederland mass flowering from October to December 2009. New shoots were observed from September to December .

Uses — This bamboo is widely used. Culms are used without splitting for lathing the mud plastered walls of houses, and in split form as material for making handicrafts, and tightening rice cakes.

Specimen examined. Tran Van Tien 2010481, Vietnam, Tuyen Quang Province, Chiem Hoa District, Trung Ha Commune , elevation 300 m asl, N22°13'943"; E105°10'513", lowland, 1 January 2011 .