1958] 



THE BOTANY OF THE GUAYANA HIGHLAND PART III 



111 



low Imsh on northwest ridge above Camp Yutaje, elev. 1500 m, Cerro Yutaje, Feb 23, 1953, 

 Mag aire 4' Maguire 35399; tree 2-4 m high, petals pink, occasional on rocks, elev. 1500 m, 

 Cerro Coro-Coro, March 2, 1953, Maguire $ Maguire 35464; shrub 3 m, flowers pink with 

 yellow centers, Cerro Yavi, elev. 2200 m, March 1-3, 1947, K. D. Phelps # C. B. Hitchcoek 55. 



Typical G. sessilifolia, as represented on Roraima. Ilu-tepui, Ptari-tepni, and 

 Chimanta-tepui, has white petals and ovary apex truncate without collar. On 

 Anyan-tepni exists still another population with pink petals, persistent 

 pubescence on the lower leaf -surf ace, and truncate ovary apex ; this subspecies 

 will be described at a later date. G. sessilifolia is quite variable in leaf size and 

 degree of leaf venation development ; the ovary and fruit may be either 2- or 

 3-celled. 



Bertolonia venezuelensis Wurdack, sp. nov. Figure 12, b-f. 



A congeneribus differt antheris basi postice non distincte calcaratis. 



Caulis repens (raro vix erectus) cnm petiolis dense rufo-tomentosns pilis 

 graeilibus flexuosis 1-2 mm longis (ad nodos ad 5 mm longis). Folia in caulibus 

 repentibus alterna jugi uno suppresso (in caulibns raris erectis opposita) ; 

 petiolus plerumque 4—8 cm; lamina 6-18 X 3-6 cm, ovata apice per 1-2 cm 

 caudato-aeuminata basi late acuta vel truncata margine integra vel paulo 

 irregulariterque nndnlata (acumine plerumque distincte pinnatilobnlato) 

 breviter 7-plinervia (nervos marginales includens) nervis interioribus 2-10 et 

 5-17 mm supra basim insertis ncrvulis supra obscuris subtus leviter distincteque 

 elevatis, supra modice strigulosa pilis gracillimis 5-8 mm- ca. 1 mm longis pallidis, 

 subtus in superficie glabra in nervis primariis densissime rufo-strigosa (pilis ut 

 in caulibus) in secundariis modice strigulosa tertiariis glabris sed cum glandulis 

 pallidis clavatis armatis. Pedunculus communis erectus (ad ramos 10-15 cm) 

 primum modice rufo-strigulosus demum suhglabratus, ca. medium cum nodo ; 

 rami plerumque umbellati ad anthesim 2-3 cm longi secundiflori ad nodos 

 bibracteolati, bracteola sessili submillimetrali basi cum glandulis duobus nigris 

 globosis sessilibus subtenta. Pedicelli 2-4 mm cum hypanthio sparse strigu- 

 losi pilis gracilibus ca. 0.1-0.2 mm longis. Flores 5-meri. Hypanthium 1.7 

 (ad torum) X 2.5 mm; calyx 0.4 mm coalitus, lobis 0.8 X 2.2 mm, basim versus 

 paulo imbricatis late ovatis apice truncatis extus tuberculato-dentatis dente ca. 

 1 mm longo non vel vix projecto. Petala 9.5-10 X 7.5-8.5 mm obovata vel 

 subrotundata paulo asymmetriea apice rotundata glabra eciliata. Stamina 

 isoirorphiea ; filamenta 3.2-3.7 mm longa ; antherae 2.7-3.2 mm longae paulo 

 subulatae, connectivo exappendiculato sub loculis imperspicue (0.1-0.15 mm.) 

 produeto. Stylus 5-5.5 X 0.2-0.3 mm. ; stigma punctiforme ; ovarium triloculare 

 triquetrum glabrum apice in lobulos tres obtusos carnosos 0.6 mm altos extensum. 



Type : prostrate herb, petals very pale pink inside, darker without, stamens 

 yellow, locally frequent on escarpment slopes east of Camp 3, elev. 1600 m, Cerro 

 de la Neblina, Terr. Amazonas, Venezuela, Jan 24, 1954, Bassett Maguire, John J. 

 Wiirdack, & George 8. Bunting 37370 (XY). Paratypes (same locality) : Dec 27. 

 1958, Maguire, Wurdack, d' Bunting 36951, 36947. 



B. venezuelensis represents the first record for the genus outside of south- 

 eastern Brazil. In habit, the Neblina species agrees quite well with several 

 Brazilian species, but the combination of densely rufous-pilose stems and 

 pubescent acuminate leaves are sufficient vegetative distinctions. The connective 

 being not at all prolonged into a dorsal calcar (albeit prolonged slightlv below 

 the thecae to the filament insertion) seems unique. 



