34 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [VOL. 10 



VENEZUELA: Bolivar: Cerro Guaiquinima, upper Rio Paragua, Oct 1945, Cardona 948 

 (type collection, NY, US); same locality, alt. 1740-1760 m, Cardona 1089, Maguire 32754 

 (US), 32815, 32854, 32944, 32985, 33069. 



Endemic to Cerro Guaiquinima ; frequent at 1600-1800 m elevation on or 

 just below the summit in scrub thickets or rocky , exposed areas and in scrub- 

 savannas. 



In addition to the difference between the two types of stellate pubescence, 

 this species differs from its nearest relative, R. tomentosa, in the type of in- 

 florescence, as well as in many details of the flower and leaves. R. peduncularis 

 is characterized by a dichasial inflorescence, the branches of which are unilater- 

 ally spicate ; the inflorescence of R. tomentosa is a simple, unilateral spike, 

 obviously a reduction of the dichasial arrangement of its relative. 



11. Raveniopsis nubicola Cowan, sp. nov. Fig. 17. 



Arbusculae 0.7-1.5 m altae, ramulis velutinis, foliis simplicibus. Petioli 

 crassi, 7-12 mm longi, velutini ; foliolorum laminae rigidae, valde discoloratae, 

 ovales, obovatae, ellipticae vel late ellipticae, 37-83 mm longae, 20-38 mm latae, 

 ad apicem obtusae et apiculatae, ad basim acutae, subobtusae vel obtusae, 

 marginaliter valde revolutae, supra nitidae, glabrae (costa pilosa excepta), infra 

 densissme luteo- vel cinnamomeo-tomentosae, costa impressa supra, infra valde 

 salienti, venulis subobscure impresso-reticulatis supra, infra salientibus, 12-15- 

 jugatis. Inflorescentiae dense spicatae, interdum binatae, usque ad 6 cm longas, 

 densissime piloso-velutinae, pedunculo 10-17 mm longo, bracteis ca. 5 mm longis, 

 anguste lanceolatis, acutis, persistentibus ; flores sessiles, aurantiaco-rubri. Sepala 

 crassa, densissime piloso-velutina, duobus maioribus 10 mm longis, 3 mm latis, 

 obtusis, oblanceolatis, sepalis ceteris 6-7 mm longis, 1-1.5 mm latis, lanceolatis, 

 acutis. Corolla curvata, extus pilosa in lineis, intus limbo glabro sed tubo tomen- 

 tuloso, tubo ca. 10 mm longo, lobis 5.5-7.5 mm longis, plus minusve ellipticis, 

 obtusis. Antherae 2.5 mm longae, anguste ellipticae, glabrae, dorsualiter sericeae, 

 appendieibus 0.5 mm longis, filamentis 9 mm longis, anguste oblanceolatis, vil- 

 losis. Discus 1 mm profundus, glaber, leviter crenulatus. Stylus 4 mm longus, 

 glaber. Fructorum cocci usque ad 5, piloso-velutina, 4 mm longa, 3.5 mm lata, 

 seminibus 3 mm longis, 2 mm latis, reniformibus, papillato-muricatis, nigris. 



VENEZUELA: Amazonas: Summit of Cerro de la Neblina, Rio Yatua, locally frequent 

 in scrub forest 15-18 km s\v of Cumbre Camp, alt. 2000 m; shrub 0.7-1.5 m; fls orange-red; 

 2 Dec 1957, Bassett Maguire, John J. Wurdach # Celia K. Maguire 42297 (holotype US No. 

 2267443). 



This high-altitude representative of the genus is named for its seeming 

 preference for the cloud-shrouded summit of Cerro de la Neblina. It is very 

 surely most nearly related to R. tomentosa and R. peduncular is, more closely to 

 the former than to the latter. R. nubicola differs in a number of characteristics : 

 (1) its pubescence is simple, in contrast to the dendroid-stellate pubescence of 

 its near relatives; (2) it has substantially longer petioles; (3) its sepals are 

 differently shaped and also differ somewhat in size; (4) the corolla is red in the 

 new species but white in its nearest relative; (5) the corolla lobes are longer and 

 differently shaped in the new species. 



Myllanthus Cowan, gen. nov. Fig. 22. 



Arbor ; folia opposita, trifoliolata. Inflorescentiae unilateraliter cincinnoideo- 

 racemosae, cauliflorae vel ramuliflorae ; flores pedicellati, hermaphroditi, sepalis 



