XOO MISC. PUBLICATION 303, U. S. DEPT. OF AGEICULTURE 
A small shrub ; occurs on sandy, alkaline i)lains ; flowers August-September ; 
greatly increased by overgrazing. Of some slight value as browse for livestock 
where other feed is not available. 
Chrysothamnus tumilis, see Chrysotliamnus viscidiflorus. 
Chrysothamnus latifolius, see Clirysothamnus viscidiflorus. 
Chrysothamniis leiospermns, see ChnjsotTiamnus nauseosus. 
ChrysothamnTis linifolius, see Clirysoiliamnus v^isoidiflorus. 
Chrysothamnus marianus, see Clirysotliamnus viscidiflorus. 
Chrysothamnus monocephalus, see Clirysothamnus parryi. 
Chrysothamnus nauseosus (PaUas) Britt. Rubber rabbltbrush. 
Chrysoconia nauseosa Pallas. 
Eauge : 4, 6, 7, 8, 9, 11, 12, 13, 14, 15. 
Site: Dry, sun. 
Fruit : Achene. 
A small to large shrub ; flowers September-December ; root system deep ; re- 
produces readily from seed and grows vigorously when transplanted, even when 
crowns are divided ; forms basal sprouts after cutting ; contains on the average 
2.8 percent of rubber, although this may increase to 6.5 percent in individual 
plants ; the most constant producers are those forms inhabiting alkali soils ; it 
has been estimated that 300 million pounds of good-grade rubber are represented 
in this country by this species, but extraction is not yet commercially profitable. 
Twenty subspecies or varieties are included within this species ; they rep- 
resent the species in various sections of the Great Basin and adjacent areas. 
C. nauseous includes the following forms: 
0. ligelovii (Gray) Greene, C. coUinus Greene, C. concolor Rydb., C. consimUus 
Greene, C. glareosus Rydb., C. graxeolem (Xutt.) Greene, C. leiospermus (Gray) 
Greene, C. occidentalis Greene, C. oreopliUus Nels., C. pinifolius Greene, 
C. puJcherrimus Xels. (more robust), C. saJicifoJius Rydb., C. speciosus Xutt., 
C. turtinatus Rydb. 
Certain forms, as consimili-s and viriduJus, form pure stands on alkali fiats; 
in general the important varieties are subclimax dominants of the sagebrush 
association. 
Observations: Northward it furnishes an important winter browse for elk and 
perhaps moose ; California mule deer. Value as browse for livestock depends 
on local conditions ; palatability ordinarily very low ; probably poisonous when 
eaten exclusively ; a not infrequent indicator of overgrazing. 
Chrysothamnus newberryi, see Chrysotliamnus parryi. 
Chrysothamnus occidentalis, see Chrysothamnus nauseosus. 
Chrysothamnus oreophilus, see Chrysothamnus nauseosus. 
Chrysothamnus paniculatus (Grayi Hall. Sticky rabbitbrush. 
Bigelovia paniculata Gray, Ericameri-a paniculata (Gray) Rydb. 
Range: 10. 
Site : Dry, sun. 
Fruit : Achene. 
A small to large, brittle-twigged shrub ; flowers May-October ; resistant to 
low temperatures ; grows in extremely poor soils ; rubber content about 2.5 per- 
cent, but strains may be found containing a higher percentage. 
Chrysothamnus parryi (Gray) Greene. 
Linosyris parryi Gray, Bigelovia parryi Gray. 
Range : 4, 8, 9, 10, 11, 12, 13, 15. 
Site : Dry, well-drained, sun. 
Fruit : Achene. 
A small shrub occurring on sandy or gravelly soils ; an indicator of over- 
grazing. Ten subspecies or varieties are recognized which do not separate on 
stable characters but which are more or less separated geographically ; the 
whole complex is here considered a single major species. It includes among 
others: C. asper Greene, C. neivberryi Rydb. C. vulcanicus Greene, C. mono- 
cephalus Nels. and Ken., and C. wyomingensis Nels. 
Chrysothamnus pinifolius, see Chrysothamnus nauseosus. 
