32 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



Ivor, 10 



R. fraterna is most nearly related to R. sericea; the differently shaped sepals, 

 the longer eorolla tube, and the pubescence on the under surfaces of the leaves of 

 R. fraterna are distinguishing characteristics. In this latter characteristic there 

 is not complete uniformity; the type collection has the leaves distinctly and 

 densely tomentose, the hairs rather flexuous, but the paratype collections show 

 this feature less strikingly and in some examples the hairs are even more or less 

 appressed. The flower parts are, however, quite consistently unlike in the two 



species. 



6. Raveniopsis abyssicola Cowan, sp. now Fig. 11. 



Arbuscula 2-3 m alta, ramulis pilosis, rubicundis. Petioli graciles, subap- 

 presso-strigosi, 5-14 mm longi, foliis simplicibus ; foliorum laminae coriaceae, 

 discoloratae ? infra pallidiores, ellipticae, ad basem attenuato-cuneatae, apicaliter 

 acutae, ad marginem angusto-revolutae et ciliatae, 6.5-9 cm longae, 2-3.5 cm 

 latae, supra glabrae (pilosa costa excepta), infra pilosae, costa et venulis planis 

 supra, infra salientibus, venulis ca. 20-jugatis, in vena marginali conjugentibus. 

 Inflorescentiae axillares, dichasiales, 6.5-7 cm longac. axe piloso, pedunculo 4 cm 

 longo. bracteis caducis, 1.5-2.5 mm longis, anguste ellipticis; pedicelli 1.5-2.5 mm 

 longi, strigosi. Sepala glabra intus, subappresso-strigosa extus, acuta, duo ex- 

 teriora 6-8 mm longa, 2-2.5 mm lata, anguste elliptico-oblonga, duo interiora 

 4 mm longa, 1.25 mm lata, sepalo quinto 4 mm longo, 0.5 mm lato, lineari. Corolla 

 alba, sericea valde et subabrupte curvata, tubo 11-12 mm longo, 1.5 mm diametro 

 ad basem, apicaliter ca. 4 mm diametro, lobis 5-7 mm longis, 1.25-2.5 mm latis, 

 obtuso-acutis. Stamina fertilia 2 adaxialia, filamentis 7.5 mm longis, ligulatis, 

 sericeis ad apicem, tubo cum staminodiis conjunctis, antheris anguste oblongis, 

 sericeis. ca. 1.5 mm longis et 0.7 mm latis, connectivo in subulatum mucronem 

 ca. 1 mm longo producto, antherarum basi biappendiculata, apRendicibus parvis, 

 ca. 0.3-0.6 mm longis, staminodiis ligulatis, ca. 13 mm longis, plus minusve villoso 

 sericeis. Discus cupularis, haud crassus, 0.7 mm altus ; ovarium ca. 0.9 mm altum, 

 sparse pilosulum. Fructorum cocci cornuti, 6-7 mm longi, 3 mm lati, ovati, 

 mucronati. sparse pilosuli ; semina subreniformia, 3-3.5 mm longa, 1.5-2 mm 

 lata, fulva, verruculosa ad minute muricata. 



VENEZUELA: Amazonas: Cerro de la Neblina, occasional in bottom of Canon Grande 

 ssw of Cumbre Camp, alt. 1050-1100 m; shrub 2-3 m; fls white; fruit green; 25 Dec 1957, 

 Bassett Maguire, John J. Wurdack # Celia K. Maguire 42504 (holotype, US No. 2267451). 



The specific epithet for this remarkable species is chosen to emphasize its 

 habitat preference — the bottom of the nearly mile-deep canon on Cerro de la 

 Neblina. 



Several striking distinctions combine to separate R. abyssicola from all the 

 other species of the genus: (1) the corolla is decidedly more zygomorphic than 

 that of any of the others; (2) the fertile anthers have very small, hardly notice- 

 able appendages at the base and unlike those of any of the other species are 

 tipped by the elongate connective. There are also abundant vegetative character- 

 istics to distinguish the species. 



7. Raveniopsis paruana (Cowan) Cowan, comb. nov. Fig. 15. 



Bavenia paruana Cowan, Mem. N. Y. Bot. Gard. 8:122. Apr 1953. 



VKXEZUELA: Amazonas: summit of Cerro Paru, Serrania Paru, Feb 1951, Cowan 4r 



Wurdack 312S5 (type collection). 



Apparently endemic to Cerro Paru, growing in thickets in rocky scrub- 

 savanna. 



