VAIL: STUDIES IN THE ASCLEPIADACEAE 667 
in herb, Kew: Oaxaca, Gluesbreght (also in herb. Kew). The 
last two specimens are cited in Hemsley, Biol. Centr. Am. 2: 329 
under Roulinia Jacquini. 
Differing from R. unifaria and R. racemosa in its more woody 
stem and lighter green thicker leaves. It has the crown-segments 
of R. racemosa but the pollinia of R. unifaria. 
6. Rouliniella foetida (Cav.) 
Asclepias foetida Cav. Ic. 2: 45. pl. 158. 1793. 
Cynanchum foetidum H.B.K. Nov. Gen. Sp. 3: 202. 1818? 
Roulinia Jacquinii DC. Prodr. 8: 517. 1844. Exel. syn. 
A slender twining vine. Stems glabrous or with a narrow 
puberulent line: petioles slender, 3-7 cm. long: leaves opposite ; 
blades ovate or some of the smaller ones ovate-lanceolate, 5-11 
cm. long, acuminate at the slender apex, cordate at the base with 
open sinus and rounded basal lobes, puberulent on the veins be- 
neath: flowers 8-12 mm. in diameter in small sub-umbellate 
clusters ; buds ovate : peduncles 
minutely puberulent, 2-3 cm. 
long, commonly shorter than 
the petioles: calyx 1.5 mm. 
long ; segmenis linear-oblong, 
acutish at the apex, minutely 
ciliate, with a large gland in 
_ €ach sinus: corolla 6-7 mm. 
long, dull-greenish, fleshy, 
glabrous on the outer surface, 
_ whitish or cream color? with 
__ two raised puberulent callous 
Tidges or crests along the Fic. 6. 
Upper portion within ; crown- ee 
ST sehte che very thin, 5, the lateral margins infolded and 
adnate to the inner surface, the long ligulate apex very ayehaien - 
long as the corolla segments or nearly so: anther-wings os = 
Narrow : pollinia oblong, on short broad pale yellow ees oe 
corpuscle reddish, rounded at the apex, narrower at ae i ana 
Stigma barely conic, 5-rayed : follicles angled and winged. 
follicles not seen. (Fig. 6.) ; 
Mexico: Oaxaca, Galeotti, 1538 (in herb. Kew); near 
Oaxaca, alt. 1600 m., 1896, C. Conzatti, 217+ Valley de Etla, 
Sept. 1895, C. Alvares, 768; Huitzo, alt. 1700 m., 13 Aug. 
1897, C. Conzatti & V. Gonzales, 336 (in herb. Gray). 
