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



Providence Mts., Mohave Desert, at 1500 m. alt., 1860-61, 

 Cooper, ace. to Gray; this is the only collection of the typical 

 form, but several subspecies or varieties have been found in Ari- 

 zona by Lemmon, Wilcox, MacDougal, and others. 



2. H. biennis (Gray) Hall, comb. nov. Actinella biennis 

 Gray, Proc. Am. Acad. xiii. 373 (1878). Hymenoxys canescens 

 biennis CklL, Bull. Torr. Club xxxi. 482 (1904). 



Plant 4 to 6 dm. high : stem stout, much branched, probably 

 from a biennial root : herbage puberulent or green and glabrate : 

 leaves divergent, numerous at base, scattering above, simply 3 to 

 5-parted into narrow linear lobes: heads loosely cymose: invo- 

 lucre hemispheric, 10 or 12 mm. broad; outer bracts 12 to 14. 

 acuminate, nearly distinct; inner bracts slightly longer, with 

 short subulate tips: rays 12 to 14, 12 to 25 mm. long: achenes 

 with ferruginous hairs: pappus-paleae ovate-lanceolate or cuspi- 

 date, about half as long as disk-corolla. 



Providence Mts., Mohave Desert, Brandegee ; Arizona to Utah. 



3. H. chrysanthemoides excurrens CklL, Bull. Torr. Club 

 xxxi. 501 (1904). 



Three to 6 dm. high: stem striate, much branched, from a 

 strong annual taproot : herbage minutely pubescent, the growing 

 parts somewhat tomentose : leaves 2 to 5 cm. long, 3 to 5-parted 

 into nearly filiform lobes which are sometimes again divided: 

 heads numerous, scattered on elongated peduncles: involucre 

 campanulate or almost cylindric, 5 to 9 mm. broad ; outer bracts 

 about 8, lanceolate, rigid, 5 mm. long; inner bracts ovate and 

 slightly longer, entire: rays 8 to 10 (rarely 11 or 12), yellow, 7 

 to 10 mm. long, merely toothed at apex: pappus-paleae ovate, 

 pointed, two-thirds the length of the corolla. 



Abundant on overflow land of Paloverde Valley, Riverside 

 Co. ; Schellcnger, no. 10, and Hall, no. 5914. Also near Yuma. 

 on the Arizona side of the Colorado River, Vasey, ace. to Cock- 

 erell, and Parish, no. 198. Perhaps plentiful along the river 

 both north and south of these localities, which are within the 

 Lower Sonoran Zone. 



4. H. latissima CklL, Bull. Torr. Club xxxi. 498 (1904). 

 Herbage glabrous save for some loose white hairs : cauline 



