COMPOSITAE (composite FAMILY) 557 



2. Bahia neo-mesacaaa Gray, Proc. Am. Acad. 19: 27. 1883., Stems 1-2.5 

 dm. high, minutely puberulent: leaves 3-7-parted into narrow linear divisions; 

 the uppermost Uttle shorter than the slender peduncles: involucre of about 10 

 sparingly pubescent spatulate bracts: disk-corollas small, with glandular 

 tube, almost equaled by the obovate scales of the pappus, which are much 

 thickened at and near the base. — New Mexico and southern Colorado. 



3. Bahia dissecta (Gray) Brit. Trans. N. Y. Acad. Sci. 8: 68. 1889. Stems 

 stoutish, 3-10 dm. high, puberulent or glabrous below, above with the flower- 

 ing branches and short peduncles glandular-pubescent and viscid: leaves 

 1-3-ternately divided or parted; the lobes from oblong and obtuse to nearly 

 linear: heads 10-14 mm. high and broad; bracts of the involucre 16-20, 

 crowded, oblong-lanceolate to obovate-oblong, most of "them conspicuously 

 acuminate. D. chrysanthemoides. — Along water courses; Wyoming to New 

 Mexico and Arizona. 



69. CHAENACTIS DC. 



Herbs with alternate mostly pinnately dissected leaves, pedunculate soli- 

 tary or cymose heads of yellow or (in ours) white or flesh-colored flowers, and 

 pappus mostly of entire or merely erose persistent scales (in ours 4-14). Re- 

 ceptacle flat. Heads rayless but the marginal flowers enlarged. Achenes 

 slender, linear-tetragonal or more compressed, pubescent. 



Annual 1. C. stevioides. 



Perennials. 



Heads corymbose, short-peduncled; pappus-scales S-14 , , . 2. C. Douglasii. 



Heads solitary; pappus-scales 4-6 3. C. alpina. 



1. Chaenactis Stevioides H.& A. Bot. Beech. 353. 1840. Floccose-tomentose, 

 glabrate in age, 2-3 dm. high, freely and loosely branched, bearing numerous 

 somewhat cymosely disposed heads on short, slender peduncles:, leaves 1-2- 

 pinnately parted into short, linear lobes," uppermost rarely entire: bracts of 

 involucre narrowly linear, obtuse, with obscure midrib: marginal corollas 

 with moderately ampUate unequally 5-lobed limb, not surpassing the disk: 

 scales of the pappus scarcely thickened at base, those of the inner flowers 

 oblong-lanceolate and shorter than the corolla, of the outer one ovate or ob- 

 long, often xmequal, sometimes much shorter. — Arid areas of our range, and 

 westward. 



2. Chaenactis Douglasii H. & A. 1. c. Canescent with a fine, somewhat 

 floccose tomentum, or sometimes glabrate, 1-4 dm. or more high: leaves 

 mostly of broad outline and bipinnately parted into crowded, short, and very 

 obtuse divisions and lobes: heads 12-18 mm. long, in larger plants several 

 or numerous and corymbosely cymose : scales of the pappus from linear-ligtilate 

 to narrowly oblong and one half to three fourths the length of the corolla. — 

 From Montana to New Mexico and westward. 



2a. Chaenactis Douglasii achilleaefolia (H. & A.) A. Nels. Dwarf, the 

 leaves more rosulate-tufted and their divisions crowded-approxiniate. (C. 

 achilleaefolia H. & A. 1. c). — In arid sterile soils; Wyoming to Montana and 

 Washington. 



3. Chaenactis alpina (Gray) Jones, Proc. Cal. Acad. II. 5: 699. 1895. 

 Dwarf, 6-16 crn. high, consisting of a rosette or thick tuft of leaves with very 

 approximate divisions, and naked or scapiform stems, bearing mostly solitary 

 heads, surmounting the subterranean branches of a multicipital perennial 

 caudex or rootstock: heads large, with broadly linear, rough, greenish bracts: 

 pappus scales narrowly oblong, usually 6, 2 of which are somewhat shorter 

 and narrower. C. Do-uglasii alpina. (C. pcdicularia Greene, Pitt. 4: 98. 

 1899) . — In the moimtains of Colorado. 



70. HULSEA T. & G. 



Herbs, viscid-pubescent and balsamic-scented, most of the species when 

 young floccose-wooUy, with alternate, mostly sessile, entire or dedtate ci 



