18 



b. Seed viiOjility and longevity: Viability 

 has yet to be tested. 



c. Dormancy requirements: Unknown. Probably 

 hardened by freezing temperatures over 

 winter. 



d. Germination requirements: Unknown 



e. Percent germination: Unknown 



5. Seedling ecology: Unknown 



6. Survival and mortality: No data available; 

 the species occurs most often in open habitat 

 where the "safe site" spaces between loose rock 

 would be more favorable for establishment than 

 vegetation turf. 



7. Overall assessment of teuton's reproductive 

 success: It is hypothesized that reproduction 

 does not vary by more than small factors from 

 year to year, as indicated by the uniformity of 

 flowering stalk numbers and disk corolla 

 diameter in comparing specimens. Basal 

 rosettes without inf loresences were not noted, 

 and this is an unknown life history component. 

 Seedling establishment would be expected to 

 vary greatly according to recruitment as 

 affected by wind and rainfall patterns. 



8. Population ecology of the taxon. 



A. General summary: Erigeron lackschewitzii occupies 

 areas of open vegetation, but can also persist if 

 not establish in Carex rupestris turf. 



B. Positive and neutral interactions: Individuals of 

 Erigeron lackschewitzii appear to be randomly 

 distributed, except at the lowest population 

 densities which have slightly clumped patterns. 

 This is taken to signify neutral intraspecif ic 

 interaction. 



C. Negative interactions. 



1. Herbivores/ predators^ pests, parasites and 

 diseases: None observed 



2. Competition. 



