STANDLEY TREES AND SHRUBS OF MEXICO. 1191 



24. Vincetoxicum macranthum (Kunze) Standi. 

 Gonalohus macranthns Kunze, Linnaea 20: 27. 1847. 



Fischer ia alta T. S. Brandeg. Univ. Calif. Publ. Bot. 4: 276. 1912. 



Nuevo Leon to Veracruz; type from Hacienda de la Laguna, Veracruz. 

 Guatemala. 



Stems densely pilosulous ; leaves ovate-cordate or ovate-oblong, 5 to 9 cm. 

 long, acuminate, pubescent ; pedunclos 1 to 3-flowered ; corolla about 3.5 cm. 

 broad, greenish, reticulate-veined. 



25. Vincetoxicum oaxacanum Standi. 



Gonalohus tristis Decaisne in DC. Prodr. 8: 596. 1.844. Not Vincetoxicum 

 triste Griseb. 1844. 



Oaxaca ; type from mountains of Oaxaca, altitude 2,100 meters. 



Stems glandular-papillose and sparsely hirtellous; leaves ovate-cordate, 

 4.5 to 8 cm. long, acuminate, glandular-puberulent beneath and sparsely 

 hirtellous ; corolla about 1 cm. long. 



26. Vincetoxicum pilosum (Benth.) Standi. 

 Gonolobus pilosus Benth. PL Hartw. 289. 1848. 



Jalisco to San Luis Potosi, Morelos, and Puebla ; type from Leon, Guanajuato. 



Stems pilosulous ; leaves ovate-cordate, 4 to 8 cm. long, acuminate, pubescent ; 

 peduncles few-flowered, equaling or longer than the petioles ; corolla 1.5 to 2.5 

 cm. long : follicles slender, smooth, about 10 cm. long. " Flor del muerto " 

 (Guanajuato, Dugea). 



27. Vincetoxicum crenatum Vail, Bull. Torrey Club 26: 429. 1899. 

 Type from Cuernavaca, Morelos. 



Stems retrorsely pilose; leaves cordate-ovate, 5 to 8 cm. long, acuminate, 

 papillose-puberulent ; peduncles few-flowered, longer than the petioles ; corolla 

 13 to 14 mm. long. 



28. Vincetoxicum grayanum Standi. 



Gonolobus atratus A. Gray, Proc. Amer. Acad. 22: 436. 1887. Not Vincetoxi- 

 cum atratum Morr. & Decaisne, 1836. 



Jalisco ; type from Rio Blanco. 



Stems woody, hirsute when young; leaves oblong-ovate, 5 to 7 cm. long, 

 acuminate, cordate at base, viscid-puberulent beneath ; peduncles few-flowered, 

 mostly longer than the petioles; corolla 3.5 to 4 cm. broad, black. 



29. Vincetoxicum calcicola (Greenm.) Standi. 



Gonolobus calcicola Greenm. Proc. Amer. Acad. 40: 30. 1904. 



Type from Jojutla, Morelos. 



Stems woody below, hirtellous and papillose-puberulent ; leaves ovate-cordate, 

 3 to 6 cm. long, acuminate, granular-puberulent beneath ; peduncles few- 

 ilowered, shorter than the petioles ; corolla about 2 cm. broad, brown-purple. 



30. Vincetoxicum cyclophyllum Standi., sp. nov. 



Tj'pe from Canon de la Mano Negra, near Iguala, Guerrero (Rose, Painter & 

 Rose 9355; U. S. Nat. Herb. 452841). 



Stems stout, glabrous, rising from a thick woody root; leaves long-petiolate, 

 reniform-cordate, 6 to 11.5 cm. long, 6 to 10 cm. wide, rounded at apex and 

 abruptly short-acuminate, deeply cordate at base, glabrous or sparsely puberu- 

 lent beneath near the base; cymes sessile, few-flowered, the flowers on stout 

 puberulent pedicels ; calyx lobes linear-lanceolate, 10 to 14 mm. long, glabrous ; 

 corolla brown-purple, about 1 cm. long, the lobes deltoid-ovate, subacute, bar- 

 bate within ; outer corona entire or nearly so. 



