V.\ir, : Studies in the Asclepiadaceae 



(i(;4 



meri. I have not seen any true R. nnifana as yet from Mexico. 

 It closely resembles R. raccniosa 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 R. toiifaria are not long-ligulate 

 and the pollinia are merely oblong in outline, the caudicles being 

 very short and broad. 



2. Rouliniella Columbiana sp. nov. 



A twining vine up to 7 m. long. Stems puberulent or gla- 

 brate, slender : i)etioles 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 ape.v, the cordate basal 

 lobes rounded, spreading, yellowish-green on both surfaces, spar- 

 ingly pubescent with scattered hairs : racemes about the length of 

 the petioles, io-20-nowered : 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, ap- 

 parently pale yellow, ob- 

 long, obtuse or acutish 

 when dry, the margins revo- 

 lute; crown 5 -parted ; seg- 

 ments white. 3-lqbed, 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 : antlu'r-tips scarious, inflexcd, conspicuous : pollmia 

 oblong on broad caudicles. Follicles not seen, {^''g- 2.) 



U. S. Colombia : Bohda, thickets on the lowlands near the river, 

 1898-99, rare: Herbert H. Smith, 166S. Flowers Oct.-Nov. 

 Type in the herb, of the New York Botanical Garden. 



Fig. 2. 



3. Rouliniella Palmeri (S. Wats.) 

 Roidinia Paluicri S. Wats. Proc. Am. Acad. 18 



I I 



> '883. 



A slender twining nearly glabrous vine. Stems with a narrow 

 puberulent line : leaves on slender 3—4 cm. long petioles ; blades 

 cordate-hastate, with a wide open basal sinus, acuminate at the 



