ca. 2mm. longo. Inflorescentia aut terminalis aut sub- 
terminalis pauciflora minute puberula; pedunculo crasso 
1-2 em. longo; pedicellis 2-8 mm. longis; bracteis mi- 
nute ovatis caducis. Calycis laciniae ovatae acutae ca. 2 
mm. longae extus puberulo-papillatae. Corolla infundi- 
buliformis alba extus papillata; tubo proprio gracillimo 
ca. 8 cm. longo basi ca. 1 mm. diam. ; faucibus anguste 
conicis ca. 1.5 em. longis, ostio ca. 7 mm. diam. ; lobis 
oblique dolabriformibus ca. 2 em. longis patulis. Anth- 
erae late oblongo-sagittatae ca. 4 mm. longae basi obtuse 
bilobatae dorso glabrae. Ovarii carpella oblongoidea ca. 
1.5 mm. longa glabra nectario 5-lobo basi cineta; stig- 
mate pentagono-umbraculiformi obscure apiculato ca. 
1.5 mm. longo. 
Closely allied to Mandevilla nerioides, this new species 
may be distinguished by the dense horizontal secondary 
venation of the leaves, minutely velutinous beneath. 
Cotoms1a: Comisaria del Vaupés, Rio Kananari (affluent of Rio 
Apaporis), Cerro Isibukuri. October 29, 1951. Richard Evans Schultes 
& Isidoro Cabrera 14508 (Tyre in Mo. Bot. Gard.). 
Prestonia vaupesana JW oodson sp. nov. 
Frutex volubilis omnino glaber; ramulis teretibus 
gracillimis. Folia decussata petiolata; lamina ovato- 
elliptica acuminata basi obtusa 7-12 cm. longa, 3-6 cm. 
lata firmiter membranacea; petiolo 5-7 mm. longo. In- 
florescentia simplex corymbiformis interpetiolata pluri- 
vel multiflora; pedunculo gracile 7-16 cm. longo; pedi- 
cellis gracillimis ca. 1.5 cm. longis in fructu accrescenti- 
bus; bracteis minimis. Calycis laciniae anguste oblongo- 
lanceolatae 7-8 mm. longae herbaceae apice saturiorae 
intus basi squamella truncata munitae. Corolla aut gilva 
aut livide rosea salverformis; tubo ca. 1.5 em. longo 
basi ca. 2.5 mm. diam., annulo conspicuo ca. 1 mm. alto 
minute papillato, appendicibus epistaminalibus anguste 
oblongis ca. 2 mm. longis ostio vix attingentibus; lobis 
[ 178 ] 
