1961] 



BOTANY OF THE GUAYANA HIGHLANDS PART IV (2) 



41 



inconspicue 6-dentatus dentibus non eminentibus. Petala 6-6.5 X 4-4-5 mm 

 obovata apice oblique truncata extus centraliter granuloso-sublepidoto-pubes- 

 centia. Stamina subisomorphica ; filamenta ca. 6 mm longa ; antherarum thecae 

 4.5-5 mm longae oblongo-lanceolatae connectivo postice 0.2 mm vel 0.4-0.6 mm 

 in appendice truncato prolongato antice non vel vix bilobulato glabro vel ad 

 basim per margines cum glandulis minutis sessilibus munito. Stylus 10.5-12.5 

 X 0.6-0.8 mm basim versus sparse stellato-puberulus ; stigma truncatum 0.5 mm 

 diam. ; ovarium 6-loculare apice in collum 0.7-0.9 mm altum ad verticem stellato- 

 puberulum protractum. 



VENEZUELA: Bolivar: frequent at base of Cerro San Borja, Rio Orinoco, alt. 100 m; 

 shrub 3 m, petals white, flowers mostly 6-merous; 12 Dec 1955, WurdacTc 4" Monachino 39827 

 (holotype, NV); occasional along Rio Parguaza between mouth and El Carmen (50 river 

 km upstream), alt. 80-110 m; shrub 1.5 m, flowers white; 3 Jan 1956, WurdacTc $ Monachino 

 41086; La Paragua, Rio Paragua, alt, 70 m, L. Williams 12591 (NY) (paratypes). 



The field notes for the type collection indicate that the leaves are sometimes 

 3-whorled. Both of the paratypes have leaf blades proportionately wider than 

 in the type collection and, in 41086, of thinner texture. 



Both M. aulocalyx and M. abbreviate/, have 5-merous flowers, hypanthium 

 plus calyx 3-3.5 (rather than ca. 4.5) mm long (ex Macbride photographs), 

 and entire leaves. From the foliar variability seen in New York material of 

 M. aulocalyx and M. abbreviata, the distinctness of these two species seems 

 doubtful although M. aulocalyx was described with glabrous petals and M. 

 abbreviata with pubescent petals. The flower size in M. borjensis suggests some- 

 what Miconia sect. Tamonea near M. trailii Cogn. I have examined the Kew 

 material of M. trailii, which has much larger leaves with prominent tertiary 

 veins and coarser pubescence, smaller bracteoles, and larger flowers with the 

 campanulate-oblong regularly sulcate calyces and long-attenuate anthers char- 

 acteristic of other members of sect, Tamonea, rather than suggesting a close 

 relationship with M. borjensis. 



Miconia guaiquinimae Wurdack, sp. nov. 



M. pilgerianae Ule in inflorescentiae antherarumque forma affinis, sed cum 

 foliis subtus pubescentia densissima sublepidoto-stellata appressaque vestita. 



Sect. Glossoce?itrum. Rami juniores obtuse quadrangulati vetustiores teretes 

 cum foliis subtus petiolis inflorescentiis hypanthiisque densissime granuloso- 

 stellato-pubescentes pube primum rava demum fuscescenti. Petioli 1-2 cm; 

 lamina coriacea plerumque 6-15 X 2.5-5 cm elliptica apice graditer vel sub- 

 abrupte brevi-acuminata basi late acuta vel anguste rotundato-obtusa, supra 

 primum modice stellulato-puberula demum glabrata, trinervata (jugo infra- 

 marginali debili neglecto) nervis secundariis supra anguste impressis subtus 

 elevatis utrinque 15-20 et 3-6 mm inter se distantibus tertiariis non evolutis, 

 ad margines integerrima. Inflorescentia paniculata 7-12 cm longa ramis distichis 

 ad nodos plerumque 4; flores 5-meri sessiles, bracteolis ca. 0.5 mm longis 

 oblongo-linearibus valde caducis. Hypanthium (ad torum) 2 mm altum; calycis 

 tubus 0.4 mm altus ad apicem cum lobulis indistinctis 0.2 mm altis. Petala ca. 

 2.2 X 1 mm obovato-oblonga apice rotundata extus et intus cum marginibus 

 superticieque granuloso-puberulis. Stamina paulo dimorphica apice cum poro 

 lato 0.4 mm diam. dehiscentia, filamentis ca. 2.4 mm longis. Stamina ante- 

 sepala; thecae 0.9 mm longae, connectivo sub loculis 0.7-0.9 mm prolongato et 

 postice in appendice rotundata 0.3-0.6 mm prolongato. Stamina intersepala: 

 thecae 0.9-1 mm longae, connectivo sub loculis 0.7-0,8 mm prolongato et 



