1907] HallCompositae of Southern California. 123 



7. F. eriocentra Gray, Proc. Am. Acad. vii. 355 (1868). 

 Gaertneria eriocentra Kuntze, 1. c. 



Shrubby, 3 to 9 dm. high, with numerous rigid branches: 

 herbage canescent with a minute tomentum, the leaves soon gla- 

 brate and green above : leaves cuneate-oblong to lanceolate, from 

 sinuately few-toothed or -lobed to sparingly and irregularly 

 sinuate-pinnatifid, nearly sessile by an attenuate base, 1.5 to 2.5 

 cm. long: pistillate involucre 1-flowered, equalled by its single 

 subulate beak and clothed with whitish wool which is almost as 

 long as the straight rigid subulate spines. 



Providence Mts., Mohave Desert, Cooper (ace. to Gray), 

 Brandegee; Arizona, Palmer, no. 611, also Apr., 1886, Miss Shat- 

 tuck, and Jun., 1884, Lemmon; Nevada, Jones, no. 5065. 



8. F. ilicifolia Gray, Proc. Am. Acad. xi. 77 (1876). Gaert- 

 neria ilicifolia Kuntze, 1. c. 



Shrubby, the branches hirsute or hispid, leafy to the summit : 

 leaves rigidly coriaceous, scabrous, oblong or ovate, sessile by a 

 clasping auriculate base, 2.5 to 5 cm. long, coarsely dentate with 

 spinose teeth and tipped with a rigid spine: fertile involucre 

 ovoid, glandular-pubescent, 12 mm. broad including the very 

 numerous slender uncinate prickles. 



Signal Mt, Colorado Desert, Imperial Co., Mar. 30, 1901. 

 Brandegee; same station, Abrams, no. 3184; Cajon de Santa 

 Maria, Lower California, May 14, 1889, Brandegee. 



F. AMBROSIOIDES Cav., a shrubby species of Arizona and 

 Mexico, is to be looked for along our southeastern borders. Leaves 

 oblong-lanceolate, dentate or serrate, 5 to 10 cm. long : bur nearly 

 12 mm. long, with slender uncinate-tipped prickles 4 mm. long. 



41. XANTHIUM L. 



Coarse annual weeds with widely branching and very stout 

 stems. Leaves alternate, toothed or lobed, petioled. Heads uni- 

 sexual, the flowers greenish. Staminate heads subglobose, in a 

 terminal cluster; involucre of several distinct narrow bracts in 

 1 or 2 series receptacle cylindrical ; flowers many, separated by 

 the bracts of the receptacle; corolla tubular. Pistillate heads 



