496 COMPOSITAE (COMPOSITE FAMILY) 



narrowly subulate, rather obtuse, half the length of the stigmatic portion: 

 pappus fine and soft, rather short; achenes glabrous, 10-striate. (C. Bakeri 

 Greene, Pitt. 4: 152. 1900.) Dry plains; Wyoming to New Mexico and Utah. 



7. Chrysothamnus depressus Nutt. PI. Gamb. 171. 1848. Obscurely 

 scabro-puberulent and pale, 1-2 dm. high from a decumbent woody base; 

 branches leafy up to the glomerule or fasciculate cyme of few heads: leaves 

 short, 1-2 cm. long, lanceolate, or the lowest rather spatulate, rigid, mucronate- 

 acute, with carinate midrib and no veins: heads 10-13 mm. long; involucral 

 bracts lanceolate, gradually acuminate into an almost setaceous tip: achenes 

 glabrous, 4-6-angled and with broad epigynous disk. Plains of southwestern 

 Colorado to those of New Mexico and Texas. 



8. Chrysothamnus graveolens (Nutt.) Greene, Erythea 3: 108. 1894. 

 Stout, very leafy, almost glabrous shrub, usually 7-15 dm. high, the numerous 

 long branches ending in an ample rounded cymose corymb, the branches of 

 which are more or less tomentulose: leaves ascending, broadly to narrowly 

 linear, very acute, 5-8 cm. long, obscurely 3-nerved, glabrous: involucral 

 bracts about 4 in each vertical rank, acute, glabrous even to the margin: 

 corolla with slender tube, glabrous or with a few short hairs, the nearly cy- 

 lindric throat cleft a fourth to a third the way down: pubescence of the achenes 

 abundant, long, appressed: style-appendages at least twice the length of the 

 stigmatic portion. (C. patens Rydb. Bull. Torr. Bot. Club 31: 652. 1904; 

 C. confinis Greene, Pitt. 5: 62. 1902.) In "denudated soils " along the whole 

 eastern base of the Rocky Mountains, from New Mexico to Dakota and Montana. 



8a. Chrysothamnus graveolens glabrata (Gray) A. Nels. Leaves very 

 slender and even the branchlets glabrate. (Bigelovia graveolens glabrata Gray, 

 Proc. Am. Acad. 8: 645. 1873.) Not infrequent in Colorado and New Mexico. 



9. Chrysothamnus nauseosus (Pall.) Brit. 111. Fl. 3: 326. 1898. Stems 

 and branches lanate-tomentose, 4-8 dm. high, rather slender, terminated by 

 an ample cymose corymb: leaves narrowly linear and, with the branchlets, 

 minutely white-tomentose : involucral bracts firm, acutish, not ciliate, tomen- 

 tose on the back, or the inner ones glabrous except near the tip, all in ver- 

 tical ranks of 3 or 4: corolla with slender pubescent tube rather longer than 

 the subcylindric throat, this cleft a third of the way down: pappus copious, 

 fine, only delicately scabrous, fuscous at least in age. (C. speciosus Nutt. 

 1. c.; includes the var. albicaulis.) From the northern part of our range to 

 Washington. 



10. Chrysothamnus Bigelovii (Gray) Greene, Erythea 3: 102. 1904. Canes- 

 cent with fine close tomentum when young, becoming glabrate, shrubby, 3-7 

 dm. high, fastigiately much branched, rigid ; branches less leafy, bearing a few 

 fastigiate-clustered heads: leaves nearly filiform, short, involute: involucral 

 bracts lanceolate, acute, thinnish, all pale, short, in distinct ranks of 4-5.- 

 Dry plains of southern Colorado and adjacent New Mexico. 



11. Chrysothamnus affinis A. Nels. Bot. Gaz. 28: 374. 1899. The woody 

 base low and branched; the season's stems numerous, simple, 1-2 dm. high, 

 yellowish, glabrate: leaves crowded, linear, acute, erect or spreading, dark 

 green, nearly glabrous, 3-4 cm. long: inflorescence a crowded spicate thyrsus 

 which at maturity distinctly surpasses the leaves: bracts glabrate, arachnoid- 

 ciliate on the margins; the outer with an ovate base, contracted in a usually 

 spreading acumination; the inner linear-oblong, abruptly acuminate : corolla- 

 tube slender, bearing only a few, minute, scattering clavellate hairs, shorter 

 than the expanded tubular throat which is cleft about one fourth its length. 

 (C. Newberryi Rydb. 1. c.) Colorado and New Mexico. 



lla. Chrysothamnus affinis attenuatus (Jones) A. Nels. 1. c. An erect 

 form with very slender stems and branchlets and very narrowly acuminate 

 bracts. Known only from type locality, Marysvale, Utah. 



12. Chrysothamnus Howardii (Parry) Greene, 1. c. 113. Tufted, canes- 

 cently tomentulose when young: leaves linear, rigid, 2-4 cm. long, obscurely 

 1-nerved; upper mostly overtopping the glomerate narrow heads: involucre 

 5-flowered; the bracts thinnish, lanceolate, apiculate-acuminate, or some 

 loose outer ones with prolonged subulate-filiform appendages, all more or less 



