the short growing season. Most populations 

 of Lesquerella are in open habitats, with the 

 plants aggregated together. No evidence of 

 vegetative reproduction has been observed. 



2. Pollination 



a. Mechanisms: Rollins and Shaw (1973) 

 report that "(i)n the field, insects, 

 mostly bees and flies, were repeatedly 

 observed visiting the flowers" of 

 Lescpjerella . During field surveys, no 

 insects have been observed visiting the 

 few individuals of L. humilis that were 

 flowering. 



b. Specific known pollinators: Unknown. 



c. Other suspected pollinators: Unknown. 



d. VulnerzOsility of pollinators: Unknown. 



3. Seed dispersal 



a. General mechanisms: Each fruit of L. 

 humilis is capable of producing four 

 seeds, although usually only one ovule 

 develops in each locule, resulting in 

 two seeds per fruit (Rollins 1984). The 

 seeds are wingless, and about 2 mm (0.08 

 in.) in diameter (Rollins 1984). There 

 does not appear to be any mechanism that 

 might aid in long-distance dispersal. 

 Thus, it is likely that most seeds fall 

 near the parent plants. 



b. Specific agents: None known. 



c. VulneraJjility of dispersal agents and 

 mechanisms: Unknown. 



d. Patterns of propagule dispersal: 



Unknown. 



4. Seed biology 



a. Amount and variation of seed production: 



Details unknown. Field observations 

 indicate vigorous fruit set, with an 

 estimated 60-85% of plants producing and 

 dispersing seed in 1990. 



