NO. 2 GENTRY : LAND PLANTS 173 



with slender peduncles having capitate clusters of few-flowered, small, 

 strongly graduated involucres. 



Aster spinosus Benth., PI. Hartw. 20. 1839. 



Canyon above Puerto Escondido, Sierra Giganta, March 13, Rempel 

 i5^; April 21, Gentry 3770. 



Widely distributed in western North America from Texas and Cali- 

 fornia south to Costa Rica; type from Aguascalientes, Mexico. A 

 broom-like, bushy, gray-green perennial with reduced, remote, linear 

 leaves, the branchlets often spine-tipped. It commonly forms bushy 

 clumps along the canyon bottoms of the Sierra Giganta escarpment. 



Baccharis sarathroides Gray, Proc. Am. Acad. Sci. 17:211. 

 1882. 



San Gabriel Bay, Espiritu Santo Island, March 7, Rempel 88, west 

 end of pass. 



Widely scattered along the washes of the California Gulf Region 

 and into adjacent deserts of the southwestern United States; type from 

 near Old Mission Station, San Diego County, California. It is a rather 

 dense broom-like shrub ordinarily 1-2 m tall. The Rempel collection is 

 a low suffrutescent 1-2 dm tall, quite sterile, and doubtfully referred to 

 this species. 



CoREOCARPUs DissECTUs LONGILOBUS Blake, Proc. Am. Acad. Sci. 

 49:345. 1913. 



Leptosyne dissecta Gray, N. Am. Fl. 1 :301. 1884. 



Canyon above Puerto Escondido, Sierra Giganta, March 13, Rempel 

 163, canyon bottom. Isla San Pedro Nolasco, February 6, Dawson 1034, 



Middle Baja California and adjacent islands in the gulf; type from 

 Carmen Island. Distinguished from the typical form of the species by the 

 long filiform leaf lobes and the crenate margins of the achenes. 



CoREOCARPus Shrevei Sherff, Bot. Gaz. 97:185. 1935. 



Tiburon Island, January 25, Dawson 1015. 



Middle and southern Baja California, islands in the gulf, and middle 

 coast of Sonora. The above citation is the first record for Tiburon Island. 

 It is a widely distributed species for one that remained so long unde- 

 scribed. A winter annual flowering in the early spring ; the rays rosaceous 

 or yellow, the achenes biaristate, pectinately winged. 



CouLTERELLA CAPiTATA Vasey & Rose, C.N.H. 1:71. 1890. 



San Francisco Island, March 9, Rempel 112, hillside facing south. 



