NO. 2 GENTRY : LAND PLANTS 131 



March 10, Rempel 132 (sterile). 



Southern half of Baja California; type from La Purissima. The 

 northern limits appear to be in the mountains just north of San Ignacio 

 about Lat. 27°30'. It is a small tree with conspicuously white bark, 

 white flowers, and rather sparse open foliage. 



PiTHECOLOBiUM CONFINE Standi., C.N.H. 20:191.1919. 



Cabeza Ballena, Cape District, March 3, Rempel 61. 



A low branching, broad, spreading shrub with thick spiny branches 

 and very heavy, wide, dark brown pods, usually constricted in the mid- 

 dle, common to the river valleys and arroyos of the southern half of the 

 peninsula; the type from Cabo San Lucas. 



Prosopis juliflora (Swartz) DC, Prodr. 2:447. 1825. 



San Gabriel Bay, Espiritu Santo Island, March 7, Rempel 84 (ster- 

 ile). Agua Verde Bay, March 10, Rempel 124 (flowering). 



Widely scattered in the deserts of North America, the mesquite 

 shows many local variants which are hard to define, but which are in 

 need of close taxonomic study. 



Caesalpiniaceae 



Caesalpinia arenosa Wiggins, Cont. Dud. Herb. 3 :68, figs. 1-3. 

 1940. 



San Juanico Bay, March 2, Rempel 41. 



Sandy coastal plains in the southern part of the peninsula from Lo- 

 reto and San Juanico south nearly to La Paz; type from Guadelupe, 

 Baja California. A rather openly branched shrub up to 2 m tall related 

 to C. pannosa and C. placida, both of which are apparently cape endem- 

 ics. C. arenosa differs from the others in having tortulose branchlets, 

 puberulent, glandular leaflets, eglandular calyces, and the outer surfaces 

 of the petals glandular almost to the tip. 



Caesalpinia californica (Gray) Standi., C.N.H. 23:426. 1922. 



Punta Frailes, February 16, Dawson 1125. 



Known only from the Cape District. An open shrub with very long 

 peduncles 18 to 24 cm long, pods puberulent, eglandular, straw-colored; 

 pedicles, calyces, petals, and filaments long puberulent. First collected 

 by Xantus, this shrub has rarely been taken since. 



Caesalpinia Palmeri Wats., Proc. Am. Acad. Sci. 24:47. 1889. 

 San Carlos Bay, Sonora, February 8, Dawson 1053, 1061. 



