NO. 2 GENTRY : LAND PLANTS 159 



The above cited locality is about the northern limit of this wide- 

 spread littoral plant on the east side of the peninsula. On the Mexican 

 mainland it reaches Tiburon Island. 



Onagraceae 



Oenothera angelorum Wats., Proc. Am. Acad. Sci. 24:29. 1889. 



Los Angeles Bay, March 19, 20, Rempel 236a. 



Known only from the eastern shore of the peninsula near the type 

 locality, Los Angeles Bay. 



Oenothera cardiophylla Torr., Pacif. R.R. Rep. 5:360. 1856. 



North end of Los Angeles Bay, March 19, 20, Rempel 253a. 



Widely distributed around the north and west sides of the Gulf of 

 California, south to central Baja California, and known from the gulf 

 islands of San Luis, Angel de la Guardia, San Pedro Martir, and San 

 Marcos, Type locality, near Fort Yuma, Arizona. A winter annual or 

 possibly a short-lived perennial, it blooms in the early spring months. 



Sapotaceae 



BuMELiA occidentalis Hemsl., Biol. Cent. Am. Bot. 2: 298. 1881. 



Canyon above Puerto Escondido, March 13, Rempel 153. Los En- 

 cinos. Sierra Giganta, Gentry 4264. 



Usually a small rather bushy tree scattered in the canyons of the 

 southern part of the peninsula and northern Sonora on the lower moun- 

 tain slopes; type locality, "Sonora alta." it flowers and fruits in the 

 spring. 



Apocynaceae 



Vallesia glabra (Cav.) Link, Enum. PI. 1:207. 1821. 



Island in Concepcion Bay, March 16, Rempel 196. 



An evergreen shrub with white flowers and small pyriform trans- 

 lucent fruits adapted to the mesophytic bottomlands, particularly the 

 river margins from southern Baja California and southern Sonora south 

 along the coastal tierra caliente to South America and the West Indies. 



ASCLEPIADACEAE 



AscLEPiAS ALBICANS Wats., Proc. Am. Acad. Sci. 24:59. 1889. 



Puerto Escondido, February 11, Dawson 1107. Island in Concepcion 

 Bay, March 16, Rempel 194, on fan and low on north exposure. Puerto 

 Refugio, Angel de la Guardia Island, March 20, Rempel 268. 



Nearly throughout and confined to the Sonoran Desert; type from 

 ravine near Los Angeles Bay, Baja California. 



