550 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



24. Elaphrium pubescens Schlecht. Linnaea 16: 527. 1842. 

 Yucatan and Campeche ; type from Campeche. 



Tree, about 15 meters high ; leaflets usually 7, 3 to 5 cm. long. " Nabanche " 

 (Yucatan). 



Said to be cultivated in Yucatan and possibly an introduced species; very 

 closely related to Elaphrium graveolens H. B. K. (as which it has been re- 

 ported from Yucatan) of South America. 



25. Elaphrium tecomaca (DC) Standi. 

 Amyris tecomaca DC. Prodr. 2: 82. 1825. 



Bursera fragiUs S. Wats. Proc. Amer. Acad. 21: 422. 1886. 



Amyris sylvatwa Sesse & Moc. Fl. Mex. ed. 2. 93. 1894. Not A. sylvatica 

 Jacq. 1763. 



Sinaloa and southern Chihuahua. Type (according to Sesse and Mocino) 

 from mountains near Mazatlan (Guerrero?). 



Tree, 3 to 5 meters high, glabrous, the trunk 5 to 8 cm. in diameter ; leaflets 

 3 or 5, lanceolate or narrowly lanceolate, 3 to 6 cm. long, finely crenate-serrate. 

 " Torote" ( Chihuahua ) . 



Sesse and Mociiio give the vernacuhxr name as "tacamahaca," and state 

 that the gum was used for healing wounds. 



26. Elaphrium rubrum Rose, N. Amer. Fl. 25 : 252. 1911. 

 Terebinthus rubra Rose, Contr. U. S. Nat. Herb. 10: 121. 1906. 

 Sonora and Sinaloa; type collected near Colomas, Sinaloa. 



Shrub or small tree; leaflets 2 to 4 cm. long, bright green, glabrous. 



27. Elaphrium biflorum Rose, N. Amer. Fl. 25: 253. 1911. 

 Terebinthus liflora Rose, Contr, U. S. Nat. Herb. 10: 119. 1906. 

 Puebla ; type from Tehuacdn. 



Shrub or tree, 2 to 5 meters high, with short branches; leaflets 1 to 3 cm. 

 long, glabrate, crenate. 



28. Elaphrium laxiflorum (S. Wats.) Rose, N. Amer. Fl. 25: 253. 1911. 

 Bursera laxiflora S. Wats. Proc. Amer. Acad. 24: 44. 1889. 



Dry hillsides, Sonora and Sinaloa ; type from Guaymas, Sonora. 



Shrub or small tree with reddish brown branches ; leaflets 5 to 9, most of 

 them less than 1 cm. long, very coarsely crenate or rarely entire. "Copal" 

 (Sonora, Sinaloa) ; "torote prieto" (Sonora). 



29. Elaphrium fagaroides H. B. K. Nov. Gen. & Sp. 7: 27. pi. 611. 1824. 

 Bursera fogaroidcs Engl, in DC. Monogr. Phan. 4: 48. 1883. 

 Durango to Puebla ; type from Queretaro. 



Tree with brown branches; leaflets usually 5 or 7 and 1 to 2 cm. long. 

 "Cuajiote amarillo" (Morelos, Urbina) ; "cuajiote Colorado" (San Luis Potosi, 

 Ramirez). 



30. Elaphrium bicolor Schlecht. Linnaea 17: 625. 1843. 

 Bursera bicolor Engl, in DC. Monogr. Phan. 4: 53. 1883. 

 Morelos; type from Real de Cuautla. 



Small tree with rounded crown ; leaflets 9 to 19, 3.5 to 8 cm. long, densely 

 white-tomentose beneath ; panicles lax, 10 to 20 cm. long. 



31. Elaphrium pannosum (Engl.) Rose. N. Amer. Fl. 25: 254. 1911. 

 Bursera pannosa Engl, in DC. IMonogr. Phan. 4: 54. 1883. 



Known only from the type locality, Mirador, Veracruz ; not seen by the 

 writer. 



Leaflets 9, acute, 1.5 to 2 cm. long. 



