Dendrocalamus taybacensis N.H.Xia, V.T.Nguyen & V.L.Le

Nguyen, Van Tho, Xia, Nian-he, Nguyen, Hoang Nghia & Le, Viet Lam, 2013, Three large-stature bamboo species of Dendrocalamus (Poaceae: Bambusoideae) from northern Vietnam, Blumea 57 (3), pp. 253-262 : 259-262

publication ID	https://doi.org/10.3767/000651913X664595
persistent identifier	https://treatment.plazi.org/id/03D787DD-0839-FFB9-FD7B-F739FD9BD543
treatment provided by	Felipe
scientific name	Dendrocalamus taybacensis N.H.Xia, V.T.Nguyen & V.L.Le
status

Treatment

3. Dendrocalamus taybacensis N.H.Xia, V.T.Nguyen & V.L.Le View in CoL — Fig. 5 View Fig , 6 View Fig ; Map 1 View Map 1

Species affinis D. sinico L.C.Chia & J.L.Sun et D. calostachyo (Kurz) Kurz , sed pseudospiculis usque 14–17 mm longis, lemmatibus 6.7–9 mm longis, paleis 9.1–10.7 mm longis, ciliatis secus nervos, 4-nervatis inter carinas, antheris 5.4–6.6 mm longis,ligulis foliorum truncatis intergris differt. — Typus: Van Tho Nguyen NVT 124 (holo FSIV; iso FSIV-CH,IBSC), Vietnam, Son La, Thuan Chau, cultivated in household garden, N21°26.305', E103°41.334', alt. 587 m asl, 21 Aug. 2010.

Etymology. The specific epithet refer to name distribution region of this species, ‘tay bac’ region.

Arborescent bamboo, rhizomes pachymorph, short-necked. Culms erect, 20– 22 m tall and 15 –18 cm diam, apex pendulous; internodes terete, 31–37 cm long, wall c. 3 cm thick, initially white waxy-powdery, intranode with a 4 mm high ring of orange hairs, infranode with a 2 mm high ring of orange hairs, basal culm internodes normal. Branches several, central dominant, up to 1–1.2 m, branches present from c. 10–14 node, c. 3–4 m above ground. Culm sheaths deciduous, leathery, initially with dense appressed black hairs and thinly white powder, glabrescent with age, margins deciduously ciliate; apex nearly rounded or slightly concave; oral setae several near auricles, c. 3 mm long; auricles small, reflexed, undulate, c. 0.5–1 mm high, margins with several bristles; ligule 7–8 mm high, dentate, dentations c. 1.5 mm high, even and glabrous, sometimes lightly concave in the middle; blade triangular, erect or nearly erect, c. 1/5 as long as sheath proper, adaxially densely brown-hairy, abaxially glabrous, base extended toward both sides and joined with auricles, apex mucronate. Leaves (8–)10–11(–13) per ultimate branchlet, sheath yellowish hispid; auricles absent; ligule truncate, c. 2 mm high, entire; petiole 9–10 mm long; leaf blade oblong-lanceolate, 42–45(–52) by 7.2–8.7(–9.8) cm, apex acute, adaxially glabrous, abaxially rough, secondary veins 14–15 each side of midrib. Inflorescence iteraucant; flowering branch pendulous, leafless, with (1–)3–10 clustered pseudospikelets at each node; pseudospikelet ovate-lanceolate, (7–)14–17 by (2–) 5–6 mm, purple, apex acute; prophyll 1-keeled, 3.2–5 mm long, tomentose on keel and near the keel, apex blunt, margin ciliate; florets 5, terminal floret fertile with the palea 2-keeled, each floret closed when mature; rachilla very short and not disarticulating. Glumes 4–5, 5.5–6 mm long, yellowish brown, abaxial sparsely hispidulous in the middle, apex blunt or truncate, margins pubescent, many-veined; lemma broadly-lanceolate, 6.7–9.7 by 5–6.9 mm, sparsely tomentose, apex mucronate, margin long-ciliate, many-veined; palea longlanceolate, 9.1–10.7 by 2.5–3.3 mm, 2-keeled, densely long-ciliate along veins abaxially, 4-veined between and 2-veined on either side of keels, apex blunt or bifid, apex of uppermost palea usually bifid; lodicules absent. Anthers yellow, 5.4–6.6 mm long, exserted, apex acuminate, with few hairs; filaments free; stamens 6. Ovary narrowly ovoid, distally hairy, proximally glabrous; stigma 1, hairless; pistil 9.4–10.3 mm long. Flowering observed in August, fruit unknown.

Distribution & Habitat — Only known from two localities, Son La, Dien Bien province, cultivated. Altitude: 580– 620 m.

Phenology — The young shoots produce from August to October.

Uses — Young shoots are used for food at the local and the culms are used for house construction.

Vernacular names — Mạy púa pừng, Mạy púa.

Additional specimens examined. VIETNAM, Dien Bien, Tuan Giao, Quai

To, Van Tho Nguyen NVT 118 ( FSIV, FSIV-CH, IBSC), 21 Aug. 2010 .

Note — Dendrocalamus taybacensis is similar to D. sinicus in general appearance; however, it is distinguished by its 14–17 mm long pseudospikelets, 6.7–9 mm long lemma, 9.1–10.7 mm long palea with 4-veined between keels, 5.4–6.6 mm long anthers, and truncate and unsplit leaf sheath ligules. The distinguishable characters are expressed in Table 3.