I.7.B.2. General demographic details of each 

 population. 



m. Cattle Gulch 



1. Area: Four subpopulations covering 

 60 acres. 



2. Number and size of plants: 127 

 plants counted, ca. 65 % in flower 

 (1989) . 



3. Density: Sparse. 



4. Presence of dispersed seed: 

 Unknown . 



5. Evidence of reproduction: Presence 

 of flowers and fruit. 



6. Evidence of expansion/contraction: 

 None. 



I.7.D.4. Seed biology. 



a. Amount and variation of seed production: 



Information from permanent transects at 

 Birch Creek (004) and Charleys Gulch 

 (001) indicate that fruit production is 

 strongly related to climatic trends and, 

 perhaps to a lesser extent, 

 interspecific competition. See Appendix 

 B in Schassberger (1988) , and Appendix A 

 of this report (p. 16) . The effects of 

 Centaurea maculosa invasion on the 

 fecundity of A. fecunda are also 

 discussed in Hamilton and Mitchell-Olds 

 (1989) . 



In 1989, transects were established at 

 two sites (Lime Gulch (012) and Canyon 

 Creek (Oil)) in the Pioneer Mountains, 

 in order gain more information on the 

 life history of this species in areas 

 not invaded by spotted knapweed, 

 Centaurea maculosa (Appendix B, p. 17) . 

 This study is designed to compliment 

 research on two populations (Birch Creek 

 (004) and Charleys Gulch (001)) located 

 on the western flanks of the Sapphire 

 Mountains. 



The data collected in 1989 from the 

 Pioneer Mountains indicate that 

 fecundity was higher at Canyon Creek 

 (Oil) than at Lime Gulch (012) . The 

 number and percent of plants fruiting, 

 and the number of fruits per plant and 



