10 



temperatures range from 2.2° to 16°C (28-61°F) with 

 an average of 6.2°C (43.2°F). This places the 

 populations within a cryic soil temperature regime 



(7.2°C). Precipitation at the stations range from 

 4.3 to 7.3 cm (4.5-18.6 in). Since the climate 

 stations are located between 1250 and 1815 m 



(4103-5950 ft) and the populations occur at 2120 

 to 2880 m (6950-9450 ft) elevations, average 

 temperatures probably are lower and precipitation 

 higher at A. lackschewitzii population sites. 



POPULATION DEMOGRAPHY AND BIOLOGY 



1. PHENOLOGY: Flowering generally occurs during July 

 and August in A. lackschewitzii populations; 

 although, the first collected specimen was in 

 flower in late June (Rose s.n.). Within observed 

 populations of this perennial species, a high 

 proportion of individuals were in the rosette 

 stage in 1990. Conditions that bring a plant to 

 flower are unknown. Plants may require a number 

 of years of food storage before flowering occurs. 

 Few plants were flowering in 1990 and it may be 

 that in any particular year, few plants in a 

 population will produce flowers. 



2. POPULATION SIZE AND CONDITION: Populations of A. 

 lackschewitzii are small in size, ranging from 15 

 to 100 plants. The average area covered by a 

 population is one acre. 



3. REPRODUCTIVE BIOLOGY 



a. TYPE OF REPRODUCTION: Flowers of A. 

 lackschewitzii are perfect. Herbarium 

 specimens have demonstrated that mature 

 achenes are produced, and the presence of 

 rosettes indicates some seed germination is 

 occurring in the populations. There is no 

 information about selfing or apomixis in the 

 species. Some plants have branched caudexes 

 (pers. obs., Henderson et al. 1990), which 

 produce two to few plants vegetatively . 



b. POLLINATION BIOLOGY: There are no reports of 

 pollinators for A. lackschewitzii . Various 

 species of bees and flies were observed 

 visiting the flowers (pers. obs.). 



