132 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 10 



quiare (Rios Pacimoni-Yatua) specimens have the leaves beneath softly villose 

 with erect, relative long hairs, whereas the other collections have a close white 

 tomentum of very short, appressecl hairs. Specimens from Colombia, Vaupes, Rio 

 Kuduyari (deposited at USNH), have leaves glabrous to softly villose beneath. 



Mandevilla caurensis Mgf. 



VENEZUELA: Maguire, WurdacTc 4' Bunting 36127, Great Rapids of the Orinoco, Ama- 

 zonas, frequent at Randal de Atures, 10 km south of Pto. Ayacucho, 100-120 m elev., Nov 10, 

 1953, stout vine in low trees, flowers white, yellow in throat. Wurdach 4' Monachino 39760, Rio 

 Pargueni, Bolivar, occasional on crystalline Laja 0.5 km above river mouth, elev. 100-150 m, 

 also seen generally on all lajas at least as far as Rio fSuapure, Dec 10, 1955, succulent sprawl- 

 ing vine, corolla white, tube yellow inside. WurdacTc $ Monachino 89-848, Cerro San Borja, 

 Bolivar, abundant, elev. 100-300 m, Doc 12, 1955, corolla white, tube yellow inside; also seen 

 on Isla Sta Elena. 



The follicles of this species are now known. The mericarps are slender, bowed 

 out but often united at the apex, lightly torulose, 16-20 cm long, 3-4 mm thick, 

 glabrous, somewhat glaucous. The seeds are rusty colored, about 9 mm long, 

 1.3 mm wide, minutely hairy, the coma light cinnamon, about 1.5 mm long. 



Mandevilla duidae (Woods.) Woods. 



VENEZUELA: Amazonas: Maguire 4' Maguire Jr. 29109, Cerro Duida, summit of 

 Culebra Peak, alt. 1600 m, April 122-24, 1949, flowers yellow. Maguire, Cowan 4'- WurdacTc 

 29655, Cerro Duida, Bio Cunucunuma, mossy forest, ridge west of Cano Culebra, 1800 m alt., 

 Nov 22, 1950, vine with yellow flowers. Maguire, Cowan 4- WurdacTc 29663, Cerro Duida, Rio 

 Cunucunuma, open scrub, ridge west of Cano Culebra, 1800 m alt., Nov 22, 1950, vine with 

 yellow corollas, orange outside, fruit brown-red. Maguire, Cowan 4' WurdacTc %9809-A, Cerro 

 Huachamacari, Rio Cunucunuma, cumbre, 1700 m alt., Dec 4, 1950. 



This species was originally described in the genus Salpinctes, from a fruiting 

 specimen. It suggests a place in the neighborhood of M. lancifolia Woods, and 

 M. benthamii (A. DC.) K. Sch. in Woodson's suggenus Exothostemon. The 

 leaves are up to 12 mm wide; they have the usual glands along the midrib on 

 the upper side. The sepals are about 3 mm long ; the infunclibuliform corolla 

 has the proper tube about 3.2 cm long, the throat 2 cm long, the lobes 1.5 cm 

 long; the anthers are 6 mm long, the ovary is slightly hairy, the nectaries are 

 concrescent into a ring; the hairy seeds are 7 mm long, the brilliant tawny coma 



2 cm long. 



Mandevilla filifolia Monachino.* Figure 16. 



Frurex gracilis suberectus vel scandens, latice copioso, caule argute anguloso; 

 foliis (4-) 6- (-7)-verticillatis ; petiolis minus 1 mm longis ; laminis nliformibus 

 3-6.5 mm longis, ca. 0.5 (-4) mm latis, ad basin et apicem acutis, margine revo- 

 lutis, subglabris vel subhirtellis ; nervis secundariis numerosis erectis; costa 

 glandulifera vel nuda ; pedicellis fructiferis ca. 3 mm longis ; lobis calyeis 2 mm 

 longis. squamellis irregnlaribus, nectarinis 5; fructibus gracilibus 6-11 cm longis, 



3 mm latis, glabris ; seminibus 8-9 mm longis, 2 mm latis, pubescentibus, coma 

 2 cm longa fulva. 



Slender woody vine or snberect snbshrub, with abundant , white latex, the 

 branches mostly alternate and sharply 6-angled, brownish-grey, minutely ver- 



* Another species with whorled linear leaves in the subgenus Exothostemon has just been 

 described, M. annularii folia Woodson, Bot. Mus. Leafl. 18: 168 (1958). Our plant has a 

 shrubby habit and more strongly angled steins. The leaves differ considerably: they have 

 revolute margins and manifestly expressed secondary nerves. 



