302 COMPOSITAE 
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5510. Chrysothamnus parryi 
5511. Chrysothamnus nauseosus 
- Chrysothamnus nausedsus (Pall.) Britt. Common Rabbit-brush. Fig. 5511. 
osa Pall. in Pursh, Fl. Amer. Sept. 2: 517. 1814. 
Ch noid ophora nauseosa Britt. Mem. Torrey Club 5: 317. 1894. 
Chrysothamnus nauseosus teint in Britt. & Brown, Ill. Fl. 3: 326. 1898. 
b dm. high, commonly with several fibrous-barked, main stems from the base, these 
uch branched, the often itt-staelling, erect, usually sane leafy twigs clothed with a persistent, 
felt-like, gray, white, or greenish tomentum. Leaves variable, linear-filiform to narrowly linear- 
oblanceolate, 2-7 cm. long, 0.5—-4 mm. wide, toment subglabrou i 
cymo 
ucr y y r in 
ther definite ranks, mostly lanceolate or linear-lanceolate, not pebaig ie 9 lb usually with resin- 
ous-thickened costa ; darets usually 5, yellow, the corolla 7-12 mm. long; pappus copious, dull 
white 
Plains and mountains, most y open places, often in alkaline soil, Sonoran and Transition Zones (o 
casionally higher) ; southern Sieh gente on to California, east to Saskatchewan, Texas, and northern 7 pa 
i form oc curs “peg weed east of the a tal Divide and on the Great Plains. The following ap- 
parently natural e distinguishable in our are 
Key to Subspecies 
Achenes densely pubescent. 
Phyllaries, at least the cele mor b t enone: Saromtes oar ciliate). 
obes egrnen .3- s 9% mm en ong; styl han the stig ti 
I siecle 7-10(— Seip m. high; ae soma becely sisnduter, the worse not prominent! ee or 
fimbriate (but a more or less ciliate) ; —— = llm igh. ubsp. albicaulis 
Lene ts Sie mm. high; iollaties more or les andular- at ae margin pLomipently 
hyaline and slashed- fimbriate (or merely ciliate): eestor 9-12 mm. long. 
ubsp. ad apap 
Corolla-lobes ovate, 0.5—-1 mm. long; st le-appendage shorter than the stigmatic portion; involucre 6-7 
i 
Hesaee mostly grayish or whitish, not obviously glandular. ubsp. hololeucus. 
Herbage mostly yellow-green, the inflorescence including the involucres siidatis wdbeas scent. 
subsp. viscosus. 
Dthell + Pe Oe Peg ta és, 
lahroane 
" Plants mostly 1- o dm. ere 5 rontane in pcetangabens Oregon. subsp. nanus. 
Plants mostly 4-20 dm. ta 
Phyllaries seh rved mucro' nuke tip; corolla 7 mm e lon 
Involucre 6. Pare mm. high, not sharply angled, the racine niietitg if at all keeled. 
subsp. consimilis. 
Involucre 9-10 mm. high, sharply angled, the strongly keeled phyllaries in very distinct = 
rows. subsp. mohav 
Phyllaries with a very slender, recurved, mucronate tip; corolla less than 7 mm. lon, 
pe Soe ceruminosus 
Achenes ee or with merely a few hairs on th t ribs subsp. eMgcar 
ee seosus subsp. sibicaitis: (Nutt.) Hall & Clem. Carnegie Inst. Wash. Publ. No. 326: 
212. 1923. eCheysethomnns speciosus Nutt, Trans. Amer. Phil. Soc. II. 7: 323. 1840; C. prs} ae var. albi- 
caulis Nutt. op. cit. 324; Linosyris albicaulis Torr, & Gra €. Zt 234 1842; igelovia graveolens 
var. albicaw. oy A. ry Proc. Amer. Acad. 8: ett Bie eG Chrysothamnus californicus Greene, Erythea 3: 111 
biconlih is Ryd a¥s is — 1900; C. orthophyllus Greene, Pittonia 5: 62. 1902; 
C. nauseosus var. entalis H. M. Hall, Univ. Calif. Pub. Bot. 3: . 07; C. nauseosus var. spe — 
Hall, op. cit. eo 169. viet” ee nauseosus var. por Mebat us H. M. 1, op. cit. 174; C. nauseosus sub 
speciosus Hall & Clem. Carnegie . Wash. Publ. No. 326: 211. 1923; a nauseosus subsp. occidentalis Bali 
