66 WILD FLOWERS AND TREES OF COLORADO 



3a. Leaves ob-ovate in outline; cleft half-way to the mid-rib or less; acorns acute. 



Quercus gambellii'Nutt. 

 "Gambell'sOak" 



3b. Leaves ob-ovate in outline; cleft deeper than half-way to the mid-rib; acorns obtuse. 



Quercus nitescens Rydb. 

 "Shining Oak" 



Fig. S3- — Shining Oak {Quercus nitescens). Xi 



Genus 11. CELTIS, Hackberry 



These trees have much the appearance of elms. The leaves~are 



oblique at base and the trunk is rough and deeply furrowed. 



I a. Leaves broadly ovate; acute or short pointed at apex; ripe fruit red. 



Celtis reticulata Torr. 



"Thick-leaved Hackberry" 



lb. Leaves ovate, often long pointed at apex; ripe fruit black. Celtis douglasii Planch. 



"Douglas Hackberry" 



