* 



fruit also varied among sites in the same manner as described above. On 

 average, bolting plants produce 2.5 times as many seeds as axillary flowering 

 plants . 



During the period of 1991-93 at Lime Gulch, 53% of axillary flowering 

 plants survived to the following year, while only 5% of bolting plants 

 survived. Results for the Vipond Park population were similar, with 68% of 

 axillary flowering and 16% of bolting plants surviving. Survivorship was 

 significantly greater for axillary flowering plants at both sites for all 

 three years (x->17.3, df=2, P<0.001). 



Germination recruirements 



Germination of Arabis f ecunda seed occurred readily at room temperature 

 in the light without stratification. Site (source of seed) had no effect on 

 germination; 89% and 86% of seed from Charleys Gulch and Vipond Park 

 respectively germinated within eight days (ANOVA F=0.048, df=24, £=0.828). 

 80% of seeds from Charleys Gulch germinated in the cold and dark after 14 

 days, but only 8% of seeds from Vipond Park germinated under the same 

 conditions, and this difference was highly significant {F=129.59, df=24, 

 P<0.001). Seeds from Vipond Park remained dormant after being placed in a 

 warm light environment for eight days. The significant site*treatment 

 interaction in the full ANOVA model (Table 6) indicates that seeds from the 

 two sites are genetically different. Seeds from bolting plants germinated 

 better than those from axillary flowering parents under warm-light conditions 

 but germinated more poorly under cold, dark conditions. The significant 

 bolting X treatment interaction term in the ANOVA model suggests that seeds 

 from bolting and axillary flowering plants are genetically different (Table 

 6). 



11 



