1190 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



17. Vincetoxicum fratemum (Schleclit.) Standi. 

 Gonolobus fraternus Schlecht. Linnaea 13: 521. 1833. 



San Luis Potosi and Veracruz ; type from Hacienda de la Laguna, Veracruz. 



Leaves oblong-ovate, 4 to 7 cm. long, acute or short-acuminate, cordate at 

 base, with a broad sinus, glabrate above, pubescent beneath ; peduncles shorter 

 than the petioles, few-flowered ; corolla 8 to 10 mm. long. 



18. Vincetoxicum striatum (Mart. & Gal.) Standi. 



Gonolobus striatus Mart. & Gal. Bull. Acad. Brux. 11^: 365. 1844. 



Type from El Sabino. 



Stems pubescent-hirtous ; leaves cordate-ovate, acuminate, about 5 cm. long, 

 pubescent ; peduncles about 3-flowered, scarcely longer than the petioles ; co- 

 rolla about 2.5 cm. broad. • 



19. Vincetoxicum chrysanthum (Greenm.) Standi. 



Gonolobus clirysantlius Greenm. Proc. Amer. Acad. 32: 299. 1897. 



Mexico, Morelos, Oaxaca, and Michoacdn ; type from Patzcuaro, Michoa- 

 cSn. 



Stems hirsute and puberulent ; leaves oblong-ovate, 5 to 10 cm. long, acumi- 

 nate, cordate at base, hirtellous or hirsute; peduncles loosely few-flowered, 

 equaling or shorter than the petioles ; corolla 1.5 to 2.5 cm. broad, yellow. 



20. Vincetoxicum. stenopetalum (A. Gray) Standi. 



Gonolobus stenopetalus A. Gray, Proc. Amer. Acad. 21: 398. 1886. 



Chihuahua ; type collected near the city of Chihuahua. 



Stems suberect, woody at base, hirsute; leaves ovate-cordate, 5 to 10 cm. 

 long, acuminate, puberulent and hispidulous ; corolla 8 to 12 mm. long ; follicles 

 ovoid, muricate and hispidulous ; seeds without coma. 



21. Vincetoxicum asperum. (Decaisne) Standi. 

 Gonolobus asper Decaisne in DC. Prodr. 8: 595. 1844. 



Gonolobus purpusii T. S. Brandeg. Univ. Calif. Publ. Bot. 3: 387. 1900. 



Oaxaca and Puebla ; tj-pe from Cerro San Felipe, Oaxaca. 



Stems hirtellous ; leaves cordate-ovate, obtuse to acuminate, rough above, 

 papillose beneath and sparsely hirsute ; peduncles few-flowered ; corolla 18 to 

 25 mm. long. 



22. Vincetoxicum caudatum (A. Gray) Standi. 



Gonolobus caudatus A. Gray, Pi-oc. Amer. Acad. 21: 399. 1886. 



Gonolobus caudatus trachyanthus Greenm. Proc. Amer. Acad. 33: 482. 1898. 



Chihuahua to Puebla and Oaxaca; type from Hacienda San Jos6, south of 

 Batopilas, Chihuahua. 



Stems woody, erect, sparsely puberulent or glabrate ; leaves slender-petiolate, 

 lanceolate, caudate-acuminate, glabrous or nearly so, 4 cm. long or less; pedun- 

 ■cles 1-flowered ; corolla fuscous, 5 to 8 mm. long. 



In the typical form the corolla is glabrous within ; in G. caudatus trachii- 

 unthus it is granular-puberulent. 



23. Vincetoxicum chloranthum (Schlecht.) Standi. 

 Gonolobtis cJiloranthus Schlecht. Linnaea 13: 520. 1833. 

 Veracruz; type from Jalapa. 



Stems retrorse-pilose ; leaves ovate-oblong, acuminate, shallowly cordate at 

 base, pubescent ; peduncles shorter than the leaves, several-flowered ; corolla 

 about twice as long as the calyx. 



