496 COMPOSlTAli (OOMPOSITK i'AMlLY) 



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 brqad epigynous disk. — Plains of southwestern 

 Coloirado 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: involucra,l 

 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 

 stignaatic portion. (C. patms Rydb. Bull. Torr. Bot. Club 31: 652. 1904; 

 C. confinis Greene, Piitj'?: 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. PI. 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; 

 niinutely white-tomentose: involucral bracts firm, acutish, not cihate, 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 subcy^indric throat, this cleft a third of the way down: pappus copious, 

 fine, only delicately scabrous, fuscous at least in age. (C. spedoaus 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 tomehtum when young, becoming glabrate, shrubby, 3-7 

 dm. high, f astigiately 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 

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

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

 ciliat^ 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, iriinute, scattering clavellate hairs, shorter 

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

 (C NeMerryi Rydb. 1. c.) — Colorado and New Mexico. 



' llo. Chrysothamnus alBnis attenuatus (Jones) A. Nels. 1. c. An erect 

 form with very slender stenis and branchlets and very narrowly acuminate 

 bfadts.-^Known only from type locality, Marysvale, Utah. 



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

 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 



