Devilshead 
Dianthus monadelphus 
Dianthus pendulus 
Dianthus petraeus 
Dianthus pungens 
Dianthus sinaicus 
Dianthus superbus 
Didierea trollii 
Diffuse Hogweed 
Dotted smartweed 
Douglas' buckwheat 
Douglas's catchfly 
Douglas's knotweed 
Drosophyllum 
Dune buckwheat 
Dutchman's pipe cactus 
Early Sundew 
Early weigela 
Eastern Prickly Pear 
Eastern Prickly Pear 
Echinocactus platyacanthus 
Echinocereus pentalophus 
Echinopsis candicans 
Echinopsis hertrichiana