72 NORTH AMERICAN FLORA [Volume 34 



25. Chaenactis humilis Rydberg, sp. nov. 



A low perennial with a taproot; stems several from the crown or branched near the base, 

 floccose when young; leaves 2-5 cm. long, floccose, in age glabrate, oblanceolate in outline, 

 pinnatifid with oblong round-lobed small divisions; involucre turbinate, 7-8 mm. high, 5-10 

 mm. broad; bracts 15-20, narrowly linear, obtuse, unequal, glandular-puberulent; corollas 

 whitish, all alike, 6 mm. long, glandular-puberulent; achenes 5 mm. long, hirsute; squamellae 

 about 8, oblong, obtuse, somewhat unequal, about 3 mm. long. 



Type collected in Franklin Basin, Bear River Range, Idaho, July 24, 1910, C. P. Smith 2273 

 (herb. N. Y. Bot. Gard.). 



Distribution: Western Wyoming and eastern Idaho. 



26. Chaenactis Douglasii (Hook.) H. & A. Bot. Beech. Voy. 354. 



1838. 



Hymenopappus Douglasii Hook. Fl. Bor. Am. 1: 316. 1833. 



Hymenopappus scahlosaeus Dougl.; Hook. Fl. Bor. Am. 1: 316, as synonym. 1833. 

 Hymenopappus scabioneus Dougl.; Steud. Nom. Bot. ed. 2. I: 784. 1840. 

 Macrocarphus Douglasii Nutt. Trans. Am. Phil. Soc. II. 7: 376. 1841. 



A biennial or short-lived perennial; stem 2-4 dm. high, floccose when young, usually 

 simple below, corymbosely branched above, or rarely a few stems from the crown of the tap- 

 root; leaves 5-10 cm. long, bipinnatifid with spreading oblong, entire or toothed, short divisions, 

 floccose when young, in age glabrate; heads several; peduncles 1-3 cm. long; involucre 

 about 10 mm. long, 10-15 mm. wide, at first floccose, glandular-hirsute; bracts in 3 series, 

 linear, obtuse, all appressed, the outer shorter; corollas white, all alike, glandular-puberulent, 

 6-7 mm. long; achenes 6-7 mm. long, hirsute; squamellae about 8, linear-obtuse, unequal in 

 length, 3-5 mm. long. 



Type locality: Sandy ground of the Columbia, from the Great Falls to the Rocky Mountains 

 [Washington]. 



Distribution: Alberta and British Columbia to New Mexico and California. 



27. Chaenactis rubricauHs Rydberg, sp. nov. 



A slender perennial with short branched caudex; stems 1-3 dm. high, soon glabrate, some- 

 what glandular-puberulent above, usually tinged with red; leaves 2-5 cm. long, obovate or 

 oblanceolate in outline, soon glabrate, bipinnatifid with short oblong divisions; heads several 

 on ascending branches; involucre turbinate, about 1 cm. high and broad, green, glandular- 

 puberulent; bracts 12-18, linear, acutish, some of the outer ones shorter and usually with 

 spreading tips, obtuse; coroUas all alike, pinkish, 6 mm. long, glandular-puberulent; achenes 

 6 mm. long, hirsute and viscid; squamellae about 8, linear, obtuse, about 5 mm. long. 



Type collected in Deer Park, Placer County, California, June 22, 1910, Miss H. A. Walker 2170 

 (herb. N. Y. Bot. Gard.). 



Distribution: Mountains of California to Oregon. 



28. Chaenactis peduncularia Greene, Pittonia 4: 98. 1899. 



Chaenactis Douglasii montana M. E. Jones, Proc. Calif. Acad. II. 5: 700. 1895. 



A low perennial with a branching rootstock; stems 1-1.5 dm. high, floccose when young,. 

 more or less hirsute above; leaves 3-5 cm. long, pinnatifid with oblong lobed obtuse divisions, 

 floccose when young, the lower rather approximate, those of the stem rather scattered; pe- 

 duncles 1-3 cm. long; involucre 12-15 mm. long, 15-18 mm. broad, floccose when young, and 

 hirsute; bracts linear, acutish; coroUas whitish, 6-7 mm. long, glandular-puberulent, all alike; 

 achenes 6 mm. long, sparingly hirsute and glandular; squamellae 6-8, linear, obtuse, about 5- 

 mm. long. 



Type locality: Above La Plata, southern Colorado. 

 Distribution: Colorado. 



29. Chaenactis minuscula Greene, Leaflets 2: 223. 1912. 



A scapose perennial with cespitose rootstocks; leaves basal, crowded, 2-3 cm. long; 

 blades lanceolate in outline, pinnatifid or bipinnatifid with sh -rt entire or toothed divisions,. 



