Gray's Broomrape, Gray's California Broomrape: Aphyllon californicum ssp. grayanum (Synonyms: Orobanche californica ssp. grayana , Orobanche californica var. grayana, Orobanche grayana, Orobanche grayana var. grayana) -
Flat-topped Broomrape: Aphyllon corymbosum ssp. mutabile (Synonym: Orobanche corymbosa, Orobanche corymbosa ssp. mutabile)
Clustered Broomrape: Aphyllon fasciculatum (Synonyms: Anoplanthus fasciculatus, Orobanche fasciculata, Orobanche fasciculata var. fasciculata, Orobanche fasciculata var. franciscana, Orobanche fasciculata var. lutea, Orobanche fasciculata var. lutea, Orobanche fasciculata var. subulata, Orobanche fasciculata var. typica, Thalesia fasciculata, Thalesia lutea) - Like Aphyllon franciscanum but parasitic exclusively upon Artemisia sp.
Clustered Broomrape: Aphyhllon franciscanum (Synonym: Orobanche fasciculata var. franciscana) - Like Aphyllon fasciculatm but parasitic upon Eriogonum sp., Eriophyllum lanatum, Phacelia sp. and others but not on Artemisia sp.
Louisiana Broomrape, Sand-dune Broomrape, Suksdorf's Broomrape: Aphyllon ludovicianum (Synonyms: Orobanche ludoviciana, Orobanche ludoviciana ssp. ludoviciana, Orobanche ludoviciana var. arenosa, Orobanche multiflora, Orobanche multiflora var. arenosa) -
Clover Broomrape, Hellroot: Orobanche minor (Synonym: Orobanche columbiana) -
Conifer Broomrape, Ocean Spray Broomrape, Pine Broomrape, Pinewoods Broomrape: Aphyllon pinorum (Synonyms: Myzorrhiza pinorum, Orobanche pinorum, Phelipaea pinorum) -
Naked Broomrape, Purple Broomrape: Aphyllon purpureum (Synonyms: Orobanche poryphyrantha, Orobanche sedi, Orobanche uniflora ssp. occidentalis, Orobanche uniflora var. minuta, Orobanche uniflora var. occidentalis, Orobanche uniflora var. purpurea, Orobanche uniflora var. sedi) - This is the currently accepted taxonnomic designation for this species now. The following varieties are outdated but shown here to illustrate the differences.
Naked Broomrape, One-flowered Broomrape, Purple Broomrape: Orobanche uniflora var. occidentalis (Synonyms: Orobanche uniflora ssp. occidentalis, Orobanche uniflora ssp. purpurea, Orobanche uniflora var. minuta) -
Naked Broomrape, One-flowered Broomrape, Purple Broomrape: Orobanche uniflora var. purpurea (Synonym: Orobanche uniflora ssp. purpurea) -
Parentucellia, Yellow Glandweed, Yellow Parentucellia: Bellardia viscosa (Synonym: Parentucellia viscosa) -
Paintbrushes: The Genus Castilleja -
Clustered Bird's Beak, Yakima Birdbeak, Yakima Bird's-beak: Cordylanthus capitatus (Synonym: Cordylanthus nevadensis) -
Drug Eyebright, Eyebright: Euphrasia stricta (Synonyms: Euphrasia brevipila, Euphrasia condensata, Euphrasia officinalis, Euphrasia rigidula) -
Owl-clovers: The Genus Orthocarpus -
Louseworts: The Genus Pedicularis -
Little Yellowrattle, Little Yellow Rattle, Rattlepod, Yellow Rattle: Rhinanthus minor (Synonyms: Rhinanthus borealis, Rhinanthus borealis ssp. borealis, Rhinanthus borealis ssp. kyrollae, Rhinanthus borealis ssp. borealis, Rhinanthus crista-galli, Rhinanthus kyrollae, Rhinanthus minor ssp. groenlandicus, Rhinanthus minor ssp. minor) -