Elegant Zinnia 
Elephant's Foot 
Elliott's goldenrod 
Engelmann's Aster 
Erect Marsh-flower 
Erigeron aureus 
Erigeron glacialis 
Espeletia grandiflora 
Espeletia hartwegiana 
Espeletia pycnophylla 
European bellflower 
European swamp thistle 
European Umbrella Milkwort 
Fairy Fan-flower 
False Aster 
False Boneset 
False Daisy 
False oxlip 
False saw-wort 
False Sow-Thistle 
False sunflower 
False Yellowhead 
False-Plumed Thistle 
Fennel-Leaved Anacyclus