PITTIER— PLANTS FROM COLOMBIA AND CENTRAL AMERICA. 101 



Cynanchum and should be called C. ( Vincetoxicum) reflexum (Hemsley) Pittier, or 



Vincetoxicum reflexum Pittier, according to the status conceded said section. In 



transferring the species, we have followed the view of Dalla Torre and Harms and 



adopted the former name. 



Roulinia rensoni Pittier, sp. nov. Figures 8, 9. 



A voluble, slender, 



mostly glabrous vine. 

 Leaves rather sparse . 



Petioles thin, 1 .5 to 3 



cm . long. Leaf blades 



4 to 6 cm. long, 1.5 to 3 



cm. broad, thin, ovate, 



acuminate, more or less 



deeply emarginate or 



cordate at base, pale 



underneath. 



Inflorescences co- 

 rymbose, pedunculate, 



the lower flowers de- 

 ciduous. Peduncles 



rather thick, 2 to 3 cm. 



long, followed by an 



often longer rachis. 



Pedicels more or less 



pubescent, 2.5 mm. 



long. Calyx 3.5 mm. 



long, deeply incised, 



glabrous; lobules 2.9 



to 3.1 mm. long, 0.9 to 



1 mm. broad, elongate- 

 elliptic, obtuse at tip, 



ciliate; calycinal 



glands, when present, 



single or geminate. 



Corolla broadly campanulate, 5 to 5.4 mm. long, glabrous, deeply incised; lobules 4 



mm. long, 1.5 to 1.8 mm. broad at base, contracted and bearing gland ular-verru- 



cose processes at about two-thirds of 

 its total length and with rounded or 

 slightly emarginate tips. Corona in- 

 serted at the base of the gynostegium, 

 its lobes scarcely concrescent, their 

 broader lower half with involute mar- 

 gins, the tipper half trilobulate, the 

 lateral lobules scarcely salient, and the 

 \ \ ^ \ \ II J middle one forming an acute point in- 



M 1 ¥ / flexed on the gynostegium; total length 



~~ "^ of the corona 2.2 mm.; length of lower 



part 1 .2 mm . , of the middle lobule about 

 lmm. Stamens about 1.8 mm. long; 

 anthers 1.3 mm. long, 1.2 mm. broad 

 with a rounded apical membrane. Retinaculum 0.35 mm. long, 0.20 mm. broad, 

 broadly fusiform, pointed at summit, often bicuspidate at base; caudicles about 

 0,23 mm. long, narrow at base, nearly 0.18 mm. broad at tip; pollinia ovoid, 



Fig. 8.— Flower parts of Roulinia rensoni. a, Segment of calyx; b, part of 

 corolla; c, segment of corona; d, back and front views of stamen; e, 

 stigma;/, retinacle (immature?); g, mature translatorium. a-e, Scale 9; 

 /, g, scale 32. 



Fig. 9.— Flower parts of Roulinia ligulata. a, Part of 

 corona; 6, retinacle. a, Scale about 8; 6, scale 32. 



