Table 3. -Phenological observations for hardwood trees and shrubs east of the Continental Divide in Montana and Yellowstone National Park, 1928 1937. 

















Leaves 









Leaf 



Leaves 









Seed 



start 



Leaves 



Leaves 





buds 



full 



Flowers 



Flowers 



Fruits 



fall 



to color 



begin 



fallen 



Species 



burst 



grown 



start 



end 



ripe 



starts 



to wither 



to fall 



withered 



Acer glabrum 

 Average date 



Earliest date 

 Latest date 

 Standard error 

 Number of observations 



May G 



Apr. 20 

 iVIay 20 

 2 



17 



June 18 



May 25 

 July 10 

 3 



16 



May 19 



May 3 

 June 8 

 3 



15 



June 7 



May 15 

 June 24 

 3 



15 



Aug. 10 



July 5 

 Sep. 6 



Sep. 8 



Sep. 3 

 Sep. 13 



3 



3 



Aug. 19 



July 20 

 Sep. 2 

 3 



17 



Sep. 4 



Aug. 7 

 Sep. 19 

 3 



17 



Sep. 26 



Aug. 28 

 Oct. 15 

 3 



17 



AInus incana 

 Average date 

 Earliest date 

 Latest date 

 Standard error 

 Number of observations 



May 19 



Apr. 28 

 June 10 

 3 



17 



June 18 



June 1 

 June 30 

 2 



17 



Apr. 15 



Mar. 9 

 May 16 

 8 



10 



May 6 



Mar. 20 

 June 15 

 9 



10 



Aug. 3 



May 23 

 Oct. 1 



14 



11 



June 6 



June 2 

 June 9 



4 



2 



Sep. 11 



Aug. 12 

 Sep. 21 

 4 

 10 



Sep. 22 

 Aug. 18 

 Oct. 2 

 3 



12 



Oct. 5 



Sep. 20 

 Oct. 25 

 3 



12 



Amelanchier ainifolia 

 Average date 

 Earliest date 

 Latest date 

 Standard error 

 Number of observations 



May 4 



Apr. 12 

 May 29 

 3 

 27 



June 8 



May 15 

 July 13 

 3 

 27 



May 25 



Apr. 15 

 June 18 

 3 

 27 



June 5 



May 15 

 July 3 

 3 

 26 



July 29 



July 10 

 Aug. 19 

 3 

 23 



Aug. 18 



July 1 1 

 Sep. 1 5 

 7 



Aug. 24 



July 23 

 Sep. 25 

 3 

 25 



Sep. 7 



Aug. 13 

 Oct. 1 

 3 

 24 



Sep. 30 



Sep. 5 

 Oct. 21 

 2 

 24 



Ceanolhus velutinus 

 Average date 

 Earliest date 

 Latest date 

 Standard error 

 Number of observations 



May 9 



Apr. 20 

 June 1 

 4 

 10 



June 26 



May 25 

 July 16 

 6 



10 



June 18 



May 12 

 Aug. 18 

 12 



June 29 



May 26 

 Aug. 25 

 12 

 7 



Aug. 3 



July 20 

 Aug. 25 

 11 

 3 



Aug. 10 



Aug. 10 

 Aug. 10 







1 



Lonicera involucrata 

 Average date 

 Earliest date 

 Latest date 

 Standard error 

 Number of observations 



May 18 



May 6 

 May 29 



7 



3 



June 20 



June 14 

 June 26 



6 



2 



June 13 



May 30 

 June 26 



5 



6 



July 2 



June 20 

 July 14 



5 



6 



July 21 



July 11 

 July 30 



3 



6 



Aug. 21 



Aug. 16 

 Sep. 1 



5 



3 



Sep. 25 



Sep. 20 

 Sep. 27 



2 



3 



Lonicera utahensis 

 Average date 

 Earliest date 

 Latest date 

 Standard error 

 Number of observations 



Apr. 26 



Apr. 5 

 May 6 

 3 



12 



May 31 



May 15 

 July 1 

 5 



12 



May 19 



Apr. 30 

 June 2 

 3 



12 



June 8 



May 18 

 June 20 

 3 



12 



June 29 



May 6 

 July 21 



Aug. 21 



July 15 

 Sep. 19 

 6 



Sep. 6 



Aug. 21 

 Sep. 26 



5 



9 



Sep. 28 



Sep. 1 5 

 Oct. 10 



3 



9 



Pachistima myrsinites 

 Average date 

 Earliest date 

 Latest date 

 Standard error 

 Number of observations 



May 10 



Apr. 30 

 May 30 

 4 



June 17 



June 4 

 June 29 

 3 



June 27 



June 20 

 July 3 

 2 



July 18 



July 11 

 July 26 

 2 



Aug. 7 



Aug. 1 

 Aug. 17 

 2 



Aug. 29 



Aug. 8 

 Aug. 10 



Sep. 2 



Sep. 1 

 Sep. 3 







4 



Sep. 18 



Sep. 15 

 Sep. 20 



Oct. 18 



Oct. 15 

 Oct. 22 



2 



4 



Physocarpus malvaceus 

 Average date 

 Earliest date 

 Latest date 

 Standard error 

 Number of observations 



May 3 



Apr. 6 

 May 20 

 2 

 23 



June 18 



May 17 

 July 20 

 3 

 23 



June 13 



May 22 

 June 30 

 2 

 24 



July 6 



June 18 

 July 21 

 2 

 24 



Aug. 4 



June 16 

 Sep. 9 

 4 



24 



Aug. 17 



July 26 

 Sep. 18 

 16 

 3 



Aug. 9 



July 1 

 Sep. 19 

 3 

 24 



Aug. 24 



July 23 

 Sep. 26 

 3 

 24 



Sep. 25 



Aug. 28 

 Oct. 26 

 3 

 24 



Populus tremuloides 

 Average date 

 Earliest date 

 Latest date 

 Standard error 

 Number of observations 



May 16 



Apr. 20 

 June 5 

 1 



48 



June 12 



May 20 

 July 10 

 2 

 46 



May 1 



Mar. 15 

 June 2 

 3 

 35 



May 25 



Apr. 10 

 July 16 

 5 

 29 



June 10 



May 16 

 July 26 

 4 

 27 



June 1 



May 21 

 June 14 



4 



5 



Sep. 1 



July 20 

 Sep. 30 

 2 

 50 



Sep. 14 



July 23 

 Oct. 5 

 2 

 49 



Oct. 3 



Aug. 7 

 Oct. 30 

 2 

 49 



Populus trichocarpa 

 Average date 

 Earliest date 

 Latest date 

 Standard error 

 Number of observations 



May 14 



Apr. 28 

 May 29 

 3 



14 



June 20 



June 10 

 July 12 

 2 



14 



May 11 



Apr. 25 

 June 4 

 3 



10 



June 5 



Apr. 10 

 July 12 



10 



10 



July 2 



May 17 

 July 19 

 7 

 10 



Sep. 10 



July 23 

 Sep. 19 

 4 

 14 



Sep. 23 



Aug. 10 

 Oct. 3 

 4 



14 



Oct. 14 



Oct. 5 

 Oct. 22 

 2 



14 



Table 3. con. 



10 



