(477) 
Specimens examined: La Cumbre trail, Santa Ynez Mountains, 
Abrams 4307. 
10. - PLUCHEA. 
1. PLucHEA sERICEA (Nutt.) Coville, Cont. Nat. Herb. 4: 128. 
1893. 
Polypappus sericeus Nutt. Journ. Acad. Philad. II. 1: 178. 1847. 
Tessaria borealis DC.; Torr. & Gray in Emory, Notes Mil. 
Reconnois. 143. 1848, without description. 
Tessaria borealis A. Gray, Pl. Wright. 1: 102. 1852. 
Pluchea borealis A. Gray, Proc. Am. Acad. 17: 212. 1882. 
Type locality: ‘‘Rocky Mountains of Upper California.” 
Distribution: Along watercourses, extending from Santa Bar- 
bara County southward into Lower California, and eastward 
through the Mohave and Colorado Deserts to the Rio Grande. 
This species, which is commonly called “arrow-weed,” is very 
common along ditches in the Imperial Valley. Lower Sonoran. 
Specimens examined: Santa Clara Valley, Ventura County, 
Rothrock 184; San Diego, Palmer, 1875; Mohave Desert, Bran- 
degee; Calexico, Abrams 4096; Tia Juana River, Abrams 3515; 
San Miguel Mountain, Chandler 5195. 
11. BEBBIA. 
Herbage green and glabrous. 1. B.juncea. 
Herbage scabrous. 1a. B.juncea aspera. 
1. BeEBBIA JUNCEA (Benth.) Greene, Bull. Calif. Acad. 1: 180. 
1885. 
Carphephorus junceus Benth. Bot. Sulph. 21. 1844. 
Type locality: ‘Bay of Magdalena,” Lower California. 
Distribution: Western base of the San Bernardino Mountains, 
southward in the coastal region to northern Lower California. 
Lower Sonoran. 
Specimens examined: City Creek wash, near Highlands, Abrams 
2803; Santiago Canyon, Santa Ana Mountains, Helen D. 
Geis, Dec., 1902; between Grantville and Santee, Abrams 3755; 
Canyon of the San Jacinto River, Hall 2016; Santa Ana Canyon, 
San Bernardino Mountains, Shaw & Illingsworth, Aug. 10, 1901. 
