19 



b. Seed viability and longevity: Unknown. 



c. Dormancy requirements: Unknown. 



d. Germination requirements: Unknown. 



e. Percent germination: Unknown. 



5. Seedling ecology: Unknown. 



6. Survival and mortality: Unknown. 



7. Overall assessment of teuton's reproductive 

 success: The large percentage of flowering 

 and fruiting plants observed in 1990 suggests 

 a good reproductive potential. The 

 differences in plant numbers between 1987 and 

 1990 are due to the discovery of additional 

 subpopulations and are also likely due to 

 normal errors of estimation. Thus, the 

 populations are probably stable, although 

 continued monitoring will be needed to 

 confirm this. The restriction of L. humilis 

 to three locations, while other apparently 

 suitable habitat exists in the immediate 

 area, suggests that it does not disperse or 

 establish new populations readily. However, 

 this restriction may be related to edaphic 

 factors as mentioned above (I.6.B.5). 



Population ecology of the taxon 



A. General summary: Lesquerella humilis occurs in 

 sparsely vegetated areas of upper subalpine 

 krummholz and alpine tundra above upper treeline. 

 Plant cover in these communities is low and there 

 appears to be little intraspecif ic or 

 interspecific interaction which suggests that L. 

 humilis is intolerant of competition. No evidence 

 of grazing, diseases or other negative 

 interactions has been observed. 



B. Positive and neutral interactions: None known. 



C. Negative interactions 



1. Herbivores, predators, pests, parasites and 

 diseases: None known. 



