664 VaIL: STUDIES IN THE ASCLEPIADACEAE 
meri. J have not seen any true RX. wnifaria as yet from Mexico. 
It closely resembles R. racemosa in general appearance, but in the : 
latter species the leaves are commonly larger, the segments of the 
crown are 3-lobed, the central lobe long and acutely ligulate and 
the pollinia are oblanceolate in outline on very long slender cau- 
dicles. The crown-segments of 2. wzifaria are not long-ligulate 
and the pollinia are merely oblong in outline, the caudicles being 
very short and broad. 
a 2. Rouliniella Columbiana sp. nov. 
A twining vine up to 7 m. long. Stems puberulent or gla- 
brate, slender: petioles channelled, 2-4 cm. long or somewhat 
shorter than the blades: leaves opposite ; blades 3.5—8 cm. long, 
ovate-oblong, abruptly acuminate at the apex, the cordate basal 
lobes rounded, spreading, yellowish-green on both surfaces, spar- 
ingly pubescent with scattered hairs : racemes about the length of | 
a 10-20-flowered: peduncles and pedicels puberulent, 
channelled: calyx-segments 
2.5 mm. long, lanceolate, 
minutely puberulent : flow- 
ers sub-globose in bud, 
about 5 mm. in diameter 
when mature: corolla-seg- 
ments 2 mm. long, 4p 
parently pale yellow, ob- 
long, obtuse or acutis 
when dry, the margins revo" 
lute; crown 5-parted ; S¢S- 
j ments white, 3-lobed, hood- 
like, the central lobe longer and incurved over the stigma, the 
lateral lobes with a narrow callous incurving ridge or crest on the 
inner side: anther-tips scarious, inflexed, conspicuous : pollinia 
oblong on broad caudicles. Follicles not seen. (/ig. 2-) 
U.S. Cotomeia : Bonda, thickets on the lowlands near the rivet, 
1898-99, rare: Herbert H. Smith, 1668. Flowers Oct.—Nov. 
Type in the herb. of the New York Botanical Garden. 
Fic. 2. 
3. Rouliniella Palmeri (S. Wats.) 
Roulinia Palmeri S. Wats. Proc. Am. Acad. 18: 115- 1 8383. 
_A slender twining nearly glabrous vine. Stems with a narrow 
: puberulent line: leaves on slender 3-4 cm. long petioles ; blades 
av cordate-hastate, with a wide open basal sinus, acuminate at ™ 
