450° BOTANICAL GAZETTE [DECEMBER 
'A survey of field plants was made during May 1916. Plots 
covering areas 300 ft. square were studied, and the number of root- 
stocks counted and the seedlings in those areas listed. For two 
such plots about 800 plants were found, equally divided between 
the two plots. This number comprised all plants of B. sagittata of 
all sizes and ages within the plots. An accurate idea of the distri- 
bution of the plants is seen in text fig. 1. Areas 4 ft. in radius were 
Fic. 1—Field of Balsamorrhiza sagittata in vicinity of Missoula, Montana, in 
May 1916. 
closely inspected around each plant, the plants receiving numbers as 
the listing progressed. In plot 1, in the count of the first 100 
plants, one seedling each was found for numbers 2, 3, 4, 8, and 100, 
no other plant having the seedling within this radius. In plot 2, 
for the first 100 plants counted, numbers 11, 49, 69, and 70 had 
one seedling each, while number 68 had two. In a second 100 in 
plot 2, numbers 41, 61, and g1 had one seedling each. Of those 
plants observed about half had borne seeds the previous year, Or 
