696 CONTRIBUTIONS FEOM THE NATIONAL HERBARIUM. 



Stems slender, sulcate ; leaflets ovate or rhombic, 4 to 8 cm. long, the terminal 

 one very long-petiolulate, acuminate, with 1 to 3 coarse teeth on each side, 

 thin, densely puberulent or glabrate ; sepals puberulent ; fruit glabrate. 



14. Serjania plicata Radlk. Monogr. Serjan. 167. 1875. 



Known only from the original collection, from Yucatan or Tabasco. 



Stems obtusely trigonous, pubescent; leaflets ovate, 8 em. long or less, 

 crenate-dentate, soft-pubescent beneath ; fruit 4 em. long, 2.4 cm. wide, short- 

 pubescent, the cells subtomentose. 



15. Serjania rekoi Standi., sp. nov. 



Type from Las Pilas (Cerro Espino), Oaxaca, altitude 400 meters (Reko 

 3509; U. S. Nat. Herb. no. 842577). 



Sap milky ; stems glabrous, acutely trigonous, 6-sulcate, the 3 outer fascicles 

 of wood subterete; leaflets ovate or oblong-ovate, 5 to 7.5 cm. long, acuminate, 

 coarsely sinuate-serrate, subcoriaceous, lustrous, glabrous ; outer sepals glabrous ; 

 petals 3 mm. long; fruit about 2 cm. long and nearly as broad, glabrous, the 

 cells subglobose. 



16. Serjania caracasana (Jacq.) Willd. Sp. PI. 2: 465. 1799. 



Paullmia caracasana Jacq. PI. Hort. Schonbr. 1: 52. pi. 99. 1797. 



Guerrero. Central America and South America ; type from Caracas, Vene- 

 zuela. 



Stems glabrous, 6 to 8-striate; leaflets mostly lance-oblong, 6 to 15 cm. long, 

 acuminate, remotely serrate-dentate, subcoriaceous, lustrous, glabrous ; petals 

 4 to 5 mm. long ; fruit 2.5 cm. long and nearly as broad, glabrous. 



17. Serjania brachylopha Radlk. Contr. U. S. Nat. Herb. 1: 367. 1895. 

 Known only from the type locality. Tequila, Jalisco. 



Stems sparsely pilose, 6-sulcate; leaflets ovate-oblong to broadly rhombic, 

 3 to 5 cm. long, acute, subduplicate-serrate, thin, glabrous or nearly so ; outer 

 sepals puberulent, the inner tomentulose. 



18. Serjania paniculata H. B. K. Nov. Gen. & Sp. 5: 86. 1821. 

 Guerrero. Northern South America ; type from Venezuela. 



Stems glabrate, 6 to 8-costate ; leaflets elliptic to subrhombic, 4 to 7 cm, 

 long, short-acuminate, coarsely crenate-serrate, thin, barbate beneath in the 

 axils of the veins ; sepals tomentulose ; petals 4 to 5 mm. long ; fruit about 

 2 cm. long and 1.5 cm. wide, the cells densely pilosulous. 



19. Serjania scatens Radlk. Monogr. Serjan. 213. 1875. 



Reported by Radlkofer from Yucatan or Tabasco. Central America, Vene- 

 zuela, and Cuba. 



Stems subterete, puberulent or glabrate ; leaflets oblong, obtuse to acuminate, 

 distantly crenate, thin, glabrous ; sepals tomentulose ; cells of the fruit sub- 

 tomentose. 



20. Serjania mexicana (L.) Willd. Sp. PI. 2: 465. 1799. 

 PaxilVmia, mexicana L. Sp. PI. 366. 1753. 



Sonora to Veracruz and Oaxaca. Central America, Jamaica, and northern 

 South America. 



Stems usually aculeate, glabrous or pubescent; leaflets oblong to elliptic, 

 ovate, or obovate, 4 to 13 cm. long, acuminate to retuse, entire or remotely 

 dentate, thick, usually glabrous ; sepals white-tomentulose ; petals 3 mm. long ; 

 fruit 2 to 2.5 cm. long and nearly as broad, commonly glabrous. " Quirote 

 culebra " (Sonora, Palmer); " barbasco " (Sinaloa, Guatemala, Honduras); 

 " sierrilla " (Jalisco); " diente de culebra" (Sonora); " cuauhmecatl," 



