430 Vail : Studies in the Asclepiadaceae 



Mexico : Barranca near Cuernavaca, State of Morelos, Pringle, 

 no. 6388, July 27, 1895. 



Distributed as Gono/odus p'/osns Benth. Resembling in habit 

 Goiiolobus angustilobns Rob. & Greenm. (Proc. Am. Acad. 29 : 

 388. 1894) from the State of Jalisco, but differing in its yellow- 

 ish-green foliage, the more numerous flowers and the curiously 

 reticulated character of the corolla. The leaves of G. angustilobns 

 are grayish-green, the flower appears to be solitary and the corolla 

 is not at all reticulated. Detailed floral characters of this last spe- 

 cies, owing to lack of material, are not accurately known. 



In regard to the true Gonolobus pilosus Benth. (PI. Hartw. 

 289. 1848) it is perhaps worth noting that a specimen collected 

 by Dr. Coulter, in Mexico, no. 975, is preserved in the Herbarium 

 of Columbia University. This number is quoted by Hemsley 

 (Biol. Centr. Am. 2 : 333) as belonging to Gonolobus pilosus Benth. 

 It coincides in every respect with the description of that species. 

 The flowers are at least 3.5 cm. in diameter when open, and are 

 of a dark, dull reddish-purple. The calyx-segments and bracte- 

 oles are over 13 mm. long, ovate, acutish and foliaceous. The 

 crown is barely 5 -parted, lacerate-denticulate along the whole 

 margin, each division with an adnate, thickened internal appendage 

 which is laciniate and barely free at the broadly quadrate summit. 

 The pollinia are remarkably large, obliquely oblong, rounded at 

 the base and somewhat saccate, slightly tapering to the curved 

 caudicles ; corpuscle broadly obovate at the apex, abruptly con- 

 tracted to the much narrower rounded base. The hyaline anther- 

 tips are conspicuously large. 



Vincetoxicum Greggii 



Gonolobus productusToxx.Vie^.ViO\xxvd.^wx\.\6'^. 1859. In 



part. 



A slender, twining vine. Stems minutely puberulent and hir- 

 sute with short scattered hairs : leaves opposite ; petioles 5-1 5 mm. 

 long; blades 1.5-3 cm. long, or more, ovate-hastate, long- 

 acuminate at the apex, the basal lobes rounded with open sinus, 

 rather thick, papillose-puberulent on both surfaces : inflorescence 

 subcorymbose ; peduncles 1.2 cm. long, 5-8-flowered : calyx 2 (?) 

 mm. long, minutely hirsute ; segments ovate-triangular, acute, with 

 a subulate gland in each sinus : corolla subrotate, 6-^ mm. long ;. 



