18 



2. Number: 5 stems, all flowering; 

 one c luster . 



3. Density: Very small, isolated 

 c luster . 



4. Presence of dispersed seed: 

 Unknown, probably none. 



5. Evidence of reproduction: None. 



6. Evidence of population expansion 

 or decline: None. 



C. Phenology, 



I 



1. Patterns: Reaches full anthesis in mid-July; 

 when the Granite Creek South site was 

 re-visited on 6 August, the spikelets had 

 begun to senesce. The taxon is most 

 conspicuous in the field during July. 

 Details of budding, leafing, fruiting and 

 seed dispersal (if any), and germination are 

 unknown. 



S. Relation to climate and microclimate: 



Unknown. 



Reproductive biology: Owing to the apparent 

 hybrid nature of Tr isetum or thochaetum , no data 

 or information was collected on the reproductive 

 biology of the taxon, except for tetrazolium 

 tests of seed viability. 



1. Type of reproduction: Unknown; may be none. 



S. Pollination: None; the taxon has anthers 



which appear to be virtually non-functional. 



3. Seed dispersal: Unknown. 



4. Seed biology: Tetrazolium tests of seed 

 viability were conducted by the Montana 

 State Universtiy Seed Laboratory, Bozeman, 

 MT . Seeds of Tr isetum or thochaetum , T. 

 canescens , and T. wo If i i from the Granite 

 Creek South site were tested. The results 

 are shown in Table 1, p. 19. Other aspects 

 of seed biology are unknown. 



5. Seedling biology: Unknown. 



6. Survival and mortality: Unknown. 



7- Overall assessment of taxon's reproductive 

 success: Strong evidence suggests that 

 Tr isetum or thochaetum is a sporadically 

 produced, virtually sterile hybrid which is 



