104 University of California Publications in Botany. [VOL. 3 



In moist sand-washes of the Lower Sonoran Zone: Palm 

 Springs, on the Colorado Desert, Parish, no. 1657, in part; Palo- 

 verde Valley, near the Colorado River, Hall; Inyo Co., Brande- 

 gee; east to Mexico and New Mexico. 



3. S. filaginea Gray, Proc. Am. Acad. viii. 652 (1873). 

 Ancistrocarphus filagineus Gray, I.e. vii. 356 (1868). 



Plant 5 to 12 cm. high, variable as to habit, the stem some- 

 times simple below and cymosely branched above, sometimes 

 simple throughout with a single terminal cluster of heads, but 

 more commonly branched from the base and the branches erect: 

 cauline leaves narrowly linear to spatulate, about 1 cm. (.5 to 2 

 cm.) long, those involucrate to the heads much broader: pistillate 

 fertile flowers 5 to 9; their enfolding bracts (barely 3 mm. long) 

 boat-shaped, firm except at the hyaline tip, smaller than the 5 

 empty bracts which surround the sterile flowers in the center: 

 empty bracts (4 or 5 mm. long) somewhat coriaceous, tapering 

 into a rigid incurved hooked cusp, persistent and at length 

 stellately spreading : sterile flowers without pappus. 



Mohave Desert, Parry, Lemmon, ace. to Gray ; dessicated pool, 

 Mohave Desert side of Cajon Pass, May, 1882, Parish; Caliente, 

 Kern Co., Brandegee; near Paso Robles, San Luis Obispo Co., 

 Apr., 1899, Barber; thence to Oregon. Mr. Parish suggests that 

 its presence near Cajon Pass may be due to sheep, for which the 

 pass was long a much traveled highway, and that the Parry and 

 Lemmon specimens probably came from this same station. This 

 occurrence of the species out of its proper range would thus be 

 explained. Very different in appearance from S. gnaphalioides. 

 Ir that species the large rounded heads are rendered conspicuous 

 by the tawny white-woolly hyaline bracts of the fertile flowers. 

 In 8. filaginea the most conspicuous organs of the small heads are 

 the rigid bracts of the central sterile flowers, with their slender 

 incurved tips. 



30. PSILOCARPHUS Nutt. 



Depressed or prostrate white-woolly annuals. Leaves oppo- 

 site, entire, the uppermost ones involucrate around the small 

 globose heads which lack a true involucre and are solitary in the 



