NO. 2 gentry: land plants 139 



Known from the southern part of Baja California and the adjacent 

 islands of Tiburon and Ceralbo ; type from Cape San Lucas. 



Euphorbia magdalenae Benth., Bot. Voy. Sulph. 50. 1844. 



San Gabriel Bay, Espiritu Santo Island, March 7, Rempel 97 y west 

 end of pass on shell and coral. San Francisco Island, March 9, Rempel 

 107, shrub 2 feet high on south-facing hill slope. 



On both coasts and adjacent islands of the southern part of the 

 peninsula; type from Magdalena Bay, Baja California. Johnston ob- 

 served what he took to be this plant at San Pedro Bay on the coast 

 above Guaymas, but apparently failed to collect it. It is a low slender- 

 stemmed, densely and intricately branched shrub 4 to 10 dm tall, form- 

 ing low globose bushes with minute flowers in the spring. 



Euphorbia pediculifera Engelm. in Torr., U.S. & Mex. Bound. 

 Bot. 186. 1859. 



Tortuga Island, March 17, Rempel 222. North end of Los Angeles 

 Bay, March 19, 20, Rempel 259. Island in Concepcion Bay, March 16, 

 Rempel 199, in wash. San Gabriel Bay, Espiritu Santo Island, March 7, 

 Rempel 83, on beach dunes. 



Widely scattered on the deserts of southwestern United States and 

 northern Mexico and throughout most of the California Gulf Region. 



Euphorbia pediculifera linearifolia Wats., Proc. Am. Acad. 

 Sci. 24:76. 1889. 



Guaymas, Sonora, January 23, Dawson 1005 (topotype). 



Southern Sonora; type from Guaymas. It is distinguished from the 

 typical in the species by its erect habit and linear leaves. Both are winter 

 annuals flowering in the early spring or late winter. 



Euphorbia petrina Wats., Proc. Am. Acad. Sci. 24:75. 1889. 



Puerto Refugio, Angel de la Guardia Island, January 26, Dawson 

 1022. 



Known from southern Sonora, Angel de la Guardia and San Pedro 

 Martir Islands, the type from the latter. Perennial prostrate herb form- 

 ing dense mats; spring flowering. 



Euphorbia polycarpa Benth.?, Bot. Voy. Sulph. 50. 1844. 

 Tortuga Island, March 17, Rempel 204a. 



Widely scattered apparently throughout the California Gulf Region ; 

 type from Magdalena Bay, Baja California. A perennial, spring-flower- 



