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UNIVERSITY OF COLORADO STUDIES 



Genus 13. AMELANCHIER, June Berry, Service Berry 

 Seven species of this genus are recorded from the state, all but the 

 following being shrubs. 



ia. Small tree or shrub on hillsides or in canyons; the fruit a pome; leaves toothed only 

 near the apex. Amelanchier alnifolia Nutt. 



Genus 14. CRATAEGUS, Thornapple 



Trees or shrubs with stout spines and handsome^white flowers ffgrow- 

 ing along streams in the foothill region. Fruit, red, black, brown or 

 orange. (See Figs. 13 to 18.) 



Fig. 13. — Colorado Thornapple {Crataegus 

 color a&ensis). Y,\. 



1 a. Spines long, 3 to 8 cm. {\\ to 3 in.). 

 ib. Spines short, about 2 cm. (J in.). 

 2a. Anthers pink or crimson. 

 2b. Anthers white or cream. 

 3a. Pedicels glabrous. 



3b. Pedicels somewhat villous; leaves broadly ovate. 



Fig 14. — St. Lawrence Thornapple 

 (Crataegus laurentiana). X£. 



(2) I 3 



(7) 



(3) 

 (4) 



Crataegus erythropoda Ashe. 

 "Shiny-leaved Thornapple" 

 Crataegus coloradensis A. Nels. 

 "Colorado Thornapple" 



