70 NORTH AMERICAN FLORA [Volume 34 



white, 5 mm long, those of the marginal flowers only moderately enlarged but irregularly 5- 

 toothed; achenes 5 mm. long, hirsute; squamellae of the central flowers oblong-lanceolate, 

 two-thirds to three-fourths as long as the corolla, those of the marginal flowers shorter, un- 

 equal, some often very small. 



Type locality: Snake County, Idaho. 



Distribution: Wyoming to Idaho, southern California, Sonora, and New Mexico. 



16. Chaenactis brachypappa A. Gray, Proc. Am. Acad. 8: 390. 



1872. 



Chaenactis stevioides brachypappa H. M. Hall, Univ. Calif. Publ. Bot. 3: 194. 1907. 



A branched annual; stem 1-2 dm. high, floccose when young; branches ascending; 



leaves 3-5 cm. long, bipinnatifid with oblong or linear, divaricate obtuse divisions, floccose 



when young; peduncles 1-5 cm. long; involucre 7-8 mm. high, 10-12 mm. broad; bracts 



broadly linear, glandular-puberulent, obtuse; corollas dull-white, about 4 mm. long, those 



of the marginal flowers with scarcely dilated limb obliquely 5-toothed; achenes nearly 5 mm. 



long, hirsutulous; squamellae 4, all short, obtuse. [Seems to grade into C. stevioides.] 



Type locality: Pahranagat Mountains, Nevada. 

 Distribution: Southern Nevada and southern California. 



17. Chaenactis Fremontii A. Gray, Proc. Am. Acad. 19: 30. 1883. 



A branched annual; stem 2-4 dm. high, glabrate, with many ascending branches; leaves 



pinnatifid into 3-6 linear-filiform divisions or simple; involucre 8-10 mm. high, 12-15 mm. 



broad; bracts linear, acute, in age perfectly glabrous; corollas pale-flesh-colored or white, 



about 6 mm. long, those of the margin with dilated, palmate limb; achenes 5 mm. long, hirsute; 



squamellae 4, lanceolate, nearly equaling the corolla, acute, or those of the marginal flowers 



shorter and some of them obtuse. 



Type locality: Mohave Desert, California. 

 Distribution: Southern California, Nevada, and Arizona. 



18. Chaenactis Cusickii A. Gray, Syn. Fl. N. Am. 



ed.2. I 2 : 452. 1886. 



A low annual, diffusely branched at the base; stem decumbent, 1 dm. high or less, sparingly 



floccose-tomentulose, soon glabrate; leaves rather fleshy, entire, spatulate-linear, 2-3 cm. long; 



peduncles short; involucre subtended by a linear leaf, hemispheric, 7-8 mm. high and 10-12 



mm. broad; bracts thick, broadly linear, with obscure midrib; corollas 5-6 mm. long, white, 



the marginal ones not enlarged; achenes 6 mm. long, hirsute; squamellae of the pappus 10, 



about 3 mm. long, linear-oblong, nearly equal, about equaling the corolla-tube. 



Type locality: Sandy hills of the Malheur, Oregon. 

 Distribution: Oregon and Idaho. 



19. Chaenactis Xanthiana A. Gray, Proc. Am. Acad. 6: 545. 1865. 



Chaenactis glabriuscula megacephala A. Gray, Proc. Bost. Soc. Nat. Hist. 7: 146, in part. 1859. 

 Chaenactis Xanthiana inlegrifolia A. Gray, Proc. Am. Acad. 6: 545. 1865. 



A rather stout and simple annual; stem 1-4 dm. high, with erect branches, striate, spar- 

 ingly floccose when young, soon glabrate; leaves somewhat fleshy, pinnatifid into linear- 

 filiform divisions or sometimes entire and filiform, 4-6 cm. long; involucre 12—13 mm. high, 

 15-20 mm. broad; bracts linear, acute, floccose when young, with more or less foliaceous 

 hirsutulous tips; corollas whitish or flesh-colored, 7-8 mm. long, the marginal ones scarcely 

 enlarged; achenes 7-8 mm. long, hirsute; squamellae 4, lanceolate, a little shorter than the 

 corolla, and usually as many short outer ones, obovate, only 1 mm. long. 



Type locality: Fort Tejon, southern California. 



Distribution: Southern Oregon to Arizona and southern California. 



20. Chaenactis macrantha DC. Eaton, in S. Wats. Bot. King's Expl. 



171. 1871. 

 A low annual; stem 1-2 dm. high, branched near the base, floccose when young; leaves 

 3-5 cm. long, once or twice pinnatifid with oblong obtuse divisions; peduncles 2-5 cm. long; 



