552 CONTRIBUTIONS FBOM THE NATIONAL HERBARIUM. 



This is probably tlie species figured by Hernandez and described' in a chapter 

 entitled " De Copalli Quahuitl, sou Arbore Gummifera Copallifera I." 



E. glabrifolium H. B. K.' described from Michoacan, may be the same species. 



38. Elaphrium longipedunculatum Rose, N. Amer. Fl. 25 : 254. 1911. 

 Puebla and Oaxaca ; type from Almoloyas, Oaxaca. 



Tree with reddisb ^ranches ; leaflets 5 or 7, densely pubescent or glabrate, 

 1.5 to 4 cm. long. 



39. Elaphrium sessiliflorum (Engl.) Rose, N, Amer. Fl. 25: 254. 1911. 

 Biirsera sessiliflora Engl, in DC. Monogr. Phan. 4: 55. 1883. 



Bursera asplenifolia T. S. Brandeg. Univ. Calif. Publ. Bot. 3 : 382. 1909, 



Puebla and Oaxaca. 



Leaflets 15 to 21, 3 to 7 cm. long, densely pubescent. 



40. Elaphrium excelsum H. B. K. Nov. Gen. & Sp. 7 : 30. 1824. 

 Bursera excelsa Engl, in DC. Monogr. Phan. 4: 57. 1883. 

 Bursera palmcri S. Wats. Proc. Amer. Acad. 22: 402. 1887. 



Durango and Sinaloa to Chiapas ; type collected between Acapulco and Kl 

 Exido, Guerrero. Guatemala. 



Shrub or tree, 3 to 6 meters high, with reddish bark ; leaflets 5 to 9, 2.5 to 5 

 cm. long, coarsely crenate, densely pubescent. " Sisiote " (Guanajuato) ; "copal- 

 quln " (Durango); "copal" (Guerrero, Oaxaca, Guatemala). 



41. Elaphrium. queretarense Rose, N. Amer. Fl. 25: 254. 1911. 

 Quer§taro ; type collected near the city of Quer^taro. 



Tree, 4 to 5 meters high ; leaflets 7 to 9, 1 to 3 cm. long, densely pubescent. 

 Probably only a form of E. excelsum. 



42. Elaphrium rhoifolium Benth. Bot. Voy. Sulph. 10. 1844. 

 Elaphrium hindsianum Benth. Bot. Voy. Sulph. 11. 1844. 

 Terebinthtis macdougalii Rose, Torreya 6: 170. 1906. 

 Elephrium epinnatum Rose, N. Amer. Fl. 25: 243. 1911. 

 Elaphrium goldmani Rose, N. Amer. Fl. 25: 256. 1911. 



Baja California, the type from Magdalena Bay ; a closely related plant, per- 

 haps of the same species, occurs in Puebla. 



Shrub or small tree, 7.5 meters high or less, with reddish brown branches ; 

 leaves simple or pinnately 3 or 5-foliolate, copiously pubescent. " Copal." 



The bark is used locally for tanning. 



DOUBTFUL SPECIES. 



Bursera delpechiana Poisson ; Engl, in DC. Monogr. Phan. 4 : 53. 1883. 

 Type from Mexico. 



Bursera mexicana Engl, in DC. Monogr. Phan. 4: 51. 1883. Type from San 

 Luis Potosf. 



Elaphrium ariense H. B. K. Nov. Gen. & Sp. 7: 31. 1824. Type from 

 MichoacSn. 



Elaphrium copalliferum DC. Prodr. 1 : 724. 1824. Type from Mexico. 



IcioA serrata DC. Prodr. 2: 77. 1825. Type from Mexico. 



'Thesaurus 45. 1651. 



' Nov. Gen. & Sp. 7 : 28. 1824. 



