METHODS 



Many accessions of Compositae genera have been transplanted into the uniform garden 

 at the Snow Field Station in Ephraim, Utah (fig. 1) , and at various other study and 

 research areas. Observations and data collection on these plants and on plants occur- 

 ring in many natural populations throughout the Intermountain area have provided the 

 basis for this report. Much of the data collection has been for preparation of pub- 

 lished and yet to be published reports (Plummer and others 1968; Hanks and others 1973, 

 1975; Plummer 1977; McArthur and Pope 1977; McArthur and Plummer 1978; McArthur and 

 others 1978; McArthur 1979). Observations and collections were made so the floral 

 and vegetative characteristics of the shrubs as well as their use, distribution, and 

 habitat could be described and illustrated. Herbarium voucher specimens representing 

 many of these populations have been deposited in the Shrub Sciences Laboratory Herbarium 

 (SSLP) . Photographic illustrations are from plants in natural settings and at experi- 

 mental planting sites. Drawings of herbarium specimens are of plants from natural 

 populations or from plants transplanted from natural populations onto the Snow Field 

 Station. The latter are identified by culture numbers of the "U" series. 



Literature pertaining to the Compositae genera we treat was surveyed and is cited 

 throughout the paper. Existing keys and monographs were consulted in the preparation 

 of our key. 



In cases where the seeds per gram information was unknown, seeds were collected 

 from 3 to 10 accessions. A minimum of 3 cleaned lots of 100 seeds each were counted 

 and weighed on an analytical balance for each accession. The seeds-per-gram information 

 was then extrapolated. 



Hybridization experiments were first conducted in 1972 using hot water and chemical 

 treatments in an attempt to induce male sterility in Artemisia and Chrysothamnus . 

 Treatments were at different stages of phenological development, from early bud to 

 just prior to anthesis. Hot water treatments following Hayes and others (1955) were 

 from 40° C to 50° C for 2 to 10 minutes. The chemical treatment used was spraying 

 Amchem's Ethrel (2-Chloroethylphosphonic acid) at concentrations of 100 to 12,000 parts 

 per million on the inflorescences following Rowell and Miller (1971). 



Figure 1. — Mature plants 

 of composite accessions 

 transplanted as wild- 

 ings at Snow Field 



Station. (A) Chryso- 

 thamnus nauseosus ssp, 

 salicifolius (mountain 

 rubber rabbitbrush) . 



(timberline sagebrush). 



(B) Artemisia rothrockii 



2 



