1192 CONTEIBUTIONS FROM THE NATIONAL HERBAEIUM. 



31. Vincetoxicum barbatum. (H. B. K.) Standi. 



Oonolobus barbatus H. B. K. Nov. Gen. & Sp. 3: 209. pi. 239. 1819. 



Gonolobiis sororius A. Gray, Proc. Amer. Acad. 22: 437. 1887. 



Sinaloa to Oaxaca and Yucatan ; type from Campeclie. Guatemala and EI 

 Salvador. 



Stems puberulent or glabrate; leaves ovate-cordate or deltoid-cordate, 2 to 

 5.5 cm. long, acuminate, with broad shallow sinus at base; cymes sessile or 

 short-pedunculate, the pedicels long and slender; corolla about 1 cm. long; 

 truit ovoid, 8 to 12 cm. long, longitudinally winged, glabrous. " Matacoyote," 

 "cuchamper de zope" (El Salvador). 



32. Vincetoxicum pectinatum (T. S. Brandeg.) Standi. 



Gonolobiis pectinatus T. S. Brandeg. Univ. Calif. Publ. Bot. 3: 387. 1909. 



Puebla and Oaxaca ; type from San Luis Tultitlanapa, Puebla. 



Stems puberulent and sparsely hirtellous or glabrate; leaves broadly ovate- 

 cordate, 3 to 6 cm. 'long, short-acuminate ; cymes short-pedunculate, few- 

 flowered, the pedicels long and slender; corolla greenish, about 13 mm. longp 

 fruit ovoid, about 9 cm. long, 5-winged. 



33. Vincetoxicum angustilobum (Robins. & Greenm.) Standi. 



Gonolobus angustilobus Robins. & Greenm. Proc. Amer. Acad. 29: 388. 1894. 



Type collected near Tepic. 



Stems puberulent and hirsute; leaves ovate-cordate, 5 to G cm. long, acumi- 

 nate, pubescent beneath ; peduncles shorter than the petioles, 1-flowered ; calyx 

 lobes ovate, acute ; corolla green, about 2.5 cm. broad. 



34. Vincetoxicum uniflorum (H. B. K.) Standi. 



Oonolobus uniflorus H. B. K. Nov. Gen. & Sp. 3: 207. pi. 238. 181'9. 



Veracruz, Mexico, Morelos, Puebla, and Oaxaca ; type collected near the city 

 of Mexico. 



Stems puberulent and pilose; leaves ovate-cordate or ovate-oblong, 4 to 8 

 cm. long, acuminate, pubescent; peduncles shorter than the petioles, 1 or few- 

 flowered, the flowers long-pedicellate; corolla greenish, 3.5 to 4.5 cm. broad. 

 "Rosaverde" (Ramirez). 



Gonolobus virescens Decaisne,* described from Regla, Hidalgo, appears to 

 be closely related. 



35. Vincetoxicum erianthum (Decaisne) Standi. 

 Gonolobiis erianthus Decaisne in DC. Prodr. 8: 592. 1844. 

 Jalisco to Veracruz and Oaxaca ; type from Oaxaca. Guatemala. 



Stems retrorse-pilose or puberulent, woody below; leaves mostly oblong- 

 ovate, 4 to 11 cm. long, acuminate, cordate at base, pubescent ; peduncles short, 

 few-flowered ; corolla greenish, reticulate-veined. " Talayote," " flor del 

 muerto" (Guanajuato, Duges) ; " cachayumbo " (Oaxaca). 



36. Vincetoxicum nigrescens (Schlecht.) Standi. 

 Oonolobus niyrescens Schlecht. Linnaea 8: 522. 1833. 



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



Stems hirsute; leaves ovate-cordate, 4 to 10 cm. long, acute, velutinous; 

 peduncles slender, often longer than the leaves, hirsute, few-flowered; corolla 

 blackish, about 8 mm. broad, long-pilose within. 



37. Vincetoxicum nemorosum (Decaisne) Standi. 

 Gonolobus nemorosus Decaisne in DC. Prodr. 8: 596. 1844. 

 Oaxaca ; type from Mixteca Alta. 



'In DC. Prodr. 8: 596. 1844. 



