VaiL: STUDIES IN THE ASCLEPIADACEAE 665 
apex, 3-8 cm. long, grayish-green, thin: inflorescence sub-corym- 
bose : peduncles 3—5 cm. long, 5—7-flowered : flowers sub-globose 
in bud: calyx-segments slender, linear-lanceolate, 4-5 mm. long 
puberulent: corolla greenish-white, obtuse in the bud; segments 
somewhat crisped and revolute on the margin, a little longer than 
the calyx: crown-segments 
united at the base, quadrate, 
3-lobed at the apex ; middle 
lobe triangular, acutish or 
obtuse, obscurely 3-toothed 
at the apex, a little longer 
than the infolded lateral 
lobes: stigma nearly flat: 
pollinia oblong; caudicles 
broad, with an orange-colored 
spot along the upper margin : 
follicles 10 cm. long, some- 
what spongy when dry, Fic 
wrinkled, glabrous: seeds 7 ee 
mm. long, glabrous, crenate along the apex: coma 2.5—3 cm. 
long. (Fig. 3.) 
Mexico: Mountains 24 miles northeast of Monclova, State of 
Coahuila, September 1880; Palmer, 829. 
4. Rouliniella racemosa (Jacq.) 
Cynanchum racemosum Jacq. Select. Am. 81. p/. 54. 1788. 
Roulinia racemosa Kuntze, Rev. Gen. Pl. 422. 1891. 
A much branched twining vine. Stems angled, slender, gla- 
brous except for a narrow pubescent line: leaves on petioles 2-4 
~~ - cm. long ; blades ovate-cordate, 
6-9 cm. long, long-acuminate, 
with broadly rounded basal 
lobes and open sinus: inflor- 
escence racemose, shorter than 
the leaves: peduncles 4—7 cm. 
long, 10-20-flowered : flowers 
5 mm. in diameter, sub-globose 
in bud: calyx-segments lanceo- 
late, acuminate, with a gland in 
each sinus: corolla greenish- 
white; margins of the lobes 
crisped : crown-segments united 
at base, obtusely 3-lobed at the 
summit ; central lobe ligulate, twice or more longer than the 
lh 
