305 
Studies in the Asclepiadaceae,—I, 
By ANNA Murray VAIL. 
NOTES ON THE GENUS PHILIBERTELLA IN THE 
UNITED STATES. 
PHILIBERTELLA. 
[SarcosTemMA H.B.K. Nov. Gen. et Sp. 3: 193. 1818. Asto 
the three species described and not R. Br. 1809.] 
[ CERAMANTHUS (subgenus) Kunze, Linnaea, 20: 26. 1847. Not 
Hassk. 1844. ] 
[PHILIBERTIA Benth. and Hook. Gen. Pl. 2: Part 2, 750. In 
part, 1876. Not H.B.K. 1818.] 
[PHILIBERTIA A. Gray, Proc. Am. Acad. 12: 64. 1876. 
Not H.B.K. 1818.] 
The genus Pluilibertia, dedicated to J. C. Philibert, author of 
- some French elementary botanical works, was established in 
H.B.K. Nov. Gen. et Sp. 3: 195. /. 230, and founded on one 
species, Piilibertia solanoides, from Tomependa on the Amazon 
river, a species reduced by K. Schumann in Engler and Prantl, 
Nat. Pfl. Fam. 1895, to the genus Oxyséelma R. Br. 1809 where it 
seems rightfully to belong. 
Most of the North American species have been originally de- 
scribed by various authors under Sarcostemma and were reduced by 
Dr. Asa Gray to Philibertia in 1876. Sarcostemma is a genus with 
leafless jointed stems, and as far as is known does not occur on 
the American continent, those of the South American species de- 
scribed under that genus belonging either to Philibertella or to 
Oxystelma. 
_ The genus Philibertella is here accepted as described under Phii- 
bertia by K. Schumann in Engler and Prantl, Nat. Pfl. 4: 229, 
1895, as follows: 
Calyx small, 5-parted, the lobes acute; corolla campanulate or 
rotate, deeply 5-parted, the lobes acute or obtuse, with a shallow 
entire or undulate ring forming an outer crown in its throat, the 
inner or stamineal crown consisting of five turgid fleshy or hard = 
et flattish in Oa «Spee inacircle at the base ofthe 
