False Boneset 
False Daisy 
False saw-wort 
False Sow-Thistle 
False sunflower 
False Yellowhead 
False-Plumed Thistle 
Fennel-Leaved Anacyclus 
Fernleaf Yarrow 
Feverfew 
Fewleaf Sunflower 
Field marigold 
Field milk thistle 
Field pussytoes 
Field Thistle 
Field Wormwood 
Fiveneedle Pricklyleaf 
Flannel cudweed 
Flat-top White Aster 
Flax-leaved Horseweed 
Flossflower 
Flower of the Andes 
French marigold 
Frost Aster