72 WILD FLOWERS AND TREES OF COLORADO 



Fig. 64. — Choke Cherky {Prunus mdanocarpa). X J 



Genus 16. ROBINIA, Locust 

 The native Colorado locust is closely related to the common black 

 locust or yellow locust now so often planted for posts and railway ties. 



I a. Small tree or shrub with pinnately compound leaves and pink, pea-like flowers, pro- 

 ducing many-seeded pods. Along streams in southern part of state. 



Robinia neo-mexicana A. Gray. 

 "Pink Locust" 



Genus 17. ACER, Maples and Box-Elder 



ia. Leaves compound, of 3, 5 or 7 leaflets. Acer interior Britt. 



"Box-Elder" 

 ib. Leaves simple; palmately veined. (2) 



2a. Leaves longer than broad; generally three-lobed, margins distinctly serrate. 



Acer glabrum Torr. 

 "Rocky Mountain Maple" 

 2b. Leaves broader than long; three to five-lobed; margins not serrate. 



Acer grandidentatum Nutt. 

 "Mountain Sugar Maple" 



