Rabbit (Leporidae)
Rabbit, Black-tail Jack (Lepus californicus)
Rabbit, Cottontail (Sylvilagus floridanus)
Rabbitbrush (Chrysothamnus spp.)
Rabbitbrush, Douglas (Chrysothamnus viscidiflorus)
Rabbitbrush, Gray/Rubber (Chrysothamnus nauseosus)
Rabbitbrush, Southwest (Chrysothamnus pulchellus)
Raceme Blight (Botrytis cinerea)
Raceme Blight (Phytophthora spp.)
Raceme Blight (various)
Radish, Volunteer/Common (Raphanus sativus)
Radish, Wild (Raphanus raphanistrum)
Radish, Wild (Raphanus sativus)
Ragweed (Ambrosia spp.)
Ragweed, Annual (Ambrosia spp.)
Ragweed, Bur (Ambrosia grayi (A. Nelson) Shinners)
Ragweed, Common (Ambrosia elatior)
Ragweed, Common, Glyphosate Resistant (Ambrosia artemisiifolia)
Ragweed, Common, Glyphosate Susceptible (Ambrosia artemisiifolia)
Ragweed, Common/Short (Ambrosia artemisiifolia)