A New Species of Guadua, G. ciliata (Poaceae: Bambusoideae: Bambuseae), from Venezuela and Brazil Ximena Londono and Gerrit Davidse Instituto Vallecaucano de Investigaciones Cientificas-INCIVA, Apartado Aereo 5660, Cali, Colombia; Missouri Botanical Garden, P.O. Box 299, St. Louis, Missouri 63166, U.S.A. The genus Guadua, as recognized by Soderstrom & Londonio (1987), comprises ca. 30 species and is restricted to lowland areas of the New World. It is included in subtribe Guaduinae of the tribe Bam-buseae by Soderstrom & Ellis (1987). Species of Guadua are typically large, erect, woody bamboos with thorns. The type species of the genus, G. an-gustifolia Kunth, is the largest bamboo of the New World and among the largest in the world. McClure (1973) enumerated the species but recognized the group as Bambusa subg. Guadua (Kunth) Hackel. While writing an account of the genus for the Flora of the Venezuelan Guayana, it became ap-parent that a suite of collections from Venezuela and Brazil represents a new species in the genus. Guadua ciliata Londoiio & Davidse, sp. nov. TYPE: Venezuela. Territorio Federal Amazo-nas: Dpto. Atabapo, Cucurital de Caname, southern bank of the middle part of Caiio Can-ame, 3�40'N, 67�22'W, ca. 100 m, edge of forest, with Mauritia, seasonally inundated and hummocky, 30 Apr.-1 May 1979, G. Davidse, 0. Huber & S. S. Tillet 16924 (holotype, MO; isotypes, INPA, K, SI, TULV, US, VEN). Fig-ures 1, 2. Bambusa lignosa, culmis 4-10 m altis, 0.8-2.0 cmdiam., cyli:dricis, cavis, glabris vel pubescentibus, inter-nodiis 20-30 cm longis. Rhizoma sympodiale, pachy-morphum. Folia culmorum demum decidua, vagina lam-inam excedente; lamina triangularis, erecta, margine ciliata;vagina glabra, basi annularis incrassata indurataque. Ram-ificationes intravaginales, inermes, ramo uno dominante.Folia in complemento 7-11; lamina 12-27.5 cm longa,1.9-4.9 cm lata, lineari-lanceolata, nervo principali lu-teolo, infra prominenti; petiolus longus, hirsutus; ligulainterior 1.0-2.2 mm longa; vagina glabra vel pubescens,in juvenilibas setis oralibus distaliter crispis, mox deciduis.Synflorescentiae ramos terminantes, 3-7 coflorescentiae.Pseudospiculae sessiles, lineari-lanceolatae, bractea sin-gula subterLdente, prophyllo singulo, glumis fertilibus 1-3, flosculis 5-9 et anthoecii rudimento terminali prae-sente; lemma ovata, 23-27 nervata, supra glabra velsubglabra, infra strigosa, margine ciliata; palea dorso 2carinis conspicue alatis ciliatisque praedita; lodiculae 3;stamina 6, filamentis filiformibus, liberis; ovarium fusi-forme, glabrum, stylo singulo, piloso, stigmatibus tribusplumosis. Woody, climbing bamboo, lacking thorns, only the lowest portion self-supporting, the distal portion cascading down from trees. Rhizomes sympodial, pachymorph. Culms 4-10 m long, 0.8-2.0 cm diam., green when young, turning yellowish at maturity, rather slender; internodes mostly 20-30 cm long, cylindrical, usually glabrous, sometimes densely pu-berulent or appressed pubescent, hollow, with thick walls 2-4 mm wide, subsolid in the lower part of the culm and branches; nodes with a horizontal nodal line and a nearly horizontal nodal ridge, the area between the nodal line and ridge densely puberulent, a dense band 2-3 mm wide of white, retrorsely appressed hairs below the nodal line; bud solitary, positioned close to the nodal line, not elevated, plano-convex, the shoulders of the prophyll ciliolate. Culm leaves coriaceous, tardily deciduous, pushed away by the developing axillary branches; sheaths 8-15 cm long, 3.5-6.0 cm wide, abaxially glabrescent, adaxially glabrous, tessellate in the upper portion, stramineous when old, indurate, strongly attached by a basal, dark, well-marked, thickened, persistent girdle, the margins ciliate with purplish and hyaline hairs; auricles mostly lacking, rarely to 2 mm long and fimbriate on the margin with setae 5-8 mm long; inner ligule a truncate, densely ciliolate mem-brane 0.4-2.2 mm long, abaxially densely strigillose; outer ligule lacking; blades 1.0-2.4 cm long, 0.5-1.0 cm wide, triangular, erect and appressed to the culm, mucronate, thinner than the sheath, abaxially glabrous and conspicuously many-nerved, adaxially densely strigose between the nerves with hyaline or purple hairs, the margin finely ciliolate, the mucro 2-3 mm long, the junction with the sheath slightlynotched. Branching intravaginal, typically with onestrongly dominant, erect to patent branch at thelower nodes, the middle and upper nodes with adominant central branch and with 2 slender branch-es arising from lateral buds at proximal nodes of thecentral branch. Foliage leaves 7-11 per comple-NovoN 1: 21-26. 1991
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