PITTIEE PLANTS FROM COLOMBIA AND CENTRAL AMERICA. Ill 



lines, or nearly 1.5 cm. long, would be quite exceptional for either an 

 Enslenia or a Roulinia. We find the calyx to be 2.5 to 3 mm. long, 

 the corolla 5 to 5.5 mm., the corona segments from 3.5 to 4 mm. 

 With these insignificant exceptions, and on the strength of Bentham's 

 own description, I feel justified in transferring Hartweg's plant to the 

 genus Roulinia, forming the combination Roulinia liguliita (Benth.) 

 Pittier (fig. 0, p. 101). 



The following details further supplement Bentham's description: 

 Retinaculum 0.34 mm. long, 0.13 mm. broad; caudicles about 0.15 

 mm. long, rather thick; pollinia 0.35 mm. long, 0.18 mm. in diameter, 

 ovate. 



In her "Notes on the Genus Rouliniella," published 1 002 » Miss Anna 

 Murray Vail seems to have disposed satisfactorily of the Mexican and 

 a few South American species of this genus. The same botanist also 

 identifies no. 6340, Donnell Smith, with Roulinia racemosa Kuntze; 

 but this determination is very doubtful, because our plant does not 

 quite agree with Jacquin's somewhat vague description, nor with the 

 illustrations given in the mentioned paper by Miss Vail. The first 

 might apply as well to Rouliniella columbiana Vail, on account of the 

 following very clear reference to the segments of the corona: " Nec- 

 taria quinque, erecta, longitudine calycis, ovata, plana, apice tri- 

 laciniato et acuminata" and of this other one referring to the lobules 

 of the corolla: "laciniis lanceolatis, planis, patentissimis, . . . mbjce 

 paulo longioribus." Moreover, Jacquin's type was collected on the 

 hill of La Popa near Cartagena, while Miss Vail's (Herbert H. Smith, 

 no. 1668) proceeds from Honda, localities relatively close together 

 and both situated in the lower, warm region of Colombia. 



As to the use of Rouliniella advocated by Miss Vail in lieu of the 

 old Roulinia, we simply note that it is not sanctioned by Dalla Torre 

 and Harms. 



THE SPECIES OF OXYPETALUM OF THE CORDIFOLITJM GROUP. 



In his masterly monograph of the Brazilian Oxypetala/' Dr. G. O. 

 Malme established a new systematic division of the genus, into two 

 subgenera and seven sections, founded first on the structure and 

 dimensions of the translators and then on the characters of the 

 leaflets of the corona and their appendages. The following notes 

 refer to a few species, new or not specially mentioned by Dr. Malme. 



Three species of Oxypetalum have been so far described and cited 

 as occurring in western Colombia, Central America, or the West 

 Indies. They are O. (Goihqfreda) cordifolium (Vent.), 0. riparium 



a Bull. Torr. Club 29: (>(>2-G(>8. 



h In "Die Asclepiadaceae des Regnellsohen Herbar.s," Svensk. Vet. Akad. Handl. 

 34: 7. 190L. See also Ofv. Vet. Akad. Fbrh. 57: 81:5-81)."). 1900: Die systeniatisehe 

 Gliederung der Gattung Oxypetalum R. Br., by the same author. 



