California Broomrape: Orobanche californica ssp. grayana (Synonyms: Orobanche californica var. grayana, Orobanche grayana, Orobanche grayana) - Flowers on pedicels less than 3 cm long with several narrow bractlets found in addition to the wider subtending bract. Calyx 10-20 mm long with lobes much longer than the tube. The corolla is large and showy, measuring 25-40 mm long with long, widely spreading lips from 10-14 mm long. Found northwest of Lakeview, OR.

Flat-top Broomrape, Flat-topped Broomrape: Orobanche corymbosa ssp. corymbosa (Synonyms: Myzorrhiza corymbosa, Orobanche californica var. corymbosa) - Flowers on pedicels less than 3 cm long with several narrow bractlets found in addition to the wider subtending bract. Calyx 10-20 mm long with lobes much longer than the tube. Corolla 16-25 mm long with short, erect to somewhat spreading lips from 4-9 mm long.

Clustered Broomrape Orobanche fasiculata (Synonyms: Anoplanthus fasciculatus, Aphyllon fasciculatum, Orobanche fasciculata var. fasciculata, Orobanche fasciculata var. franciscana, Orobanche fasciculata var. lutea, Orobanche fasciculata var. subulata, Orobanche fasciculata var. typica, Thalesia fasciculata, Thalesia lutea) - The flowers are atop long pedicels from 3-25 cm long and which lack bractlets. 4-10 dull red to yellowish flowers may be present. The calyx lobes are shorter than to as long as the calyx-tube.

Louisiana Broomrape, Sand-dune Broomrape, Suksdorf's Broomrape: Orobanche ludoviciana ssp. ludoviciana (Synonyms: Aphyllon arenosum, Conopholis ludoviciana, Myzorrhiza ludoviciana, Orobanche ludoviciana, Orobanche ludoviciana var. arenosa, Orobanche ludoviciana var. genuina, Orobanche multiflora, Orobanche multiflora var. arenosa) - Flowers sessile with several narrow bractlets found in addition to the wider subtending bract. Calyx 10-20 mm long with lobes much longer than the tube. Corolla 15-22 mm long.

Conifer Broomrape, Ocean Spray Broomrape, Pine Broomrape, Pinewoods Broomrape: Orobanche pinorum (Synonyms: Aphyllon pinorum, Myzorrhiza pinorum, Phelipaea pinorum) - Flowers sessile or on pedicels less than 3 cm long with several narrow bractlets found in addition to the wider subtending bract. Calyx 5-8 mm long with lobes shorter than or equal to the tube.

Naked Broomrape, Oneflowered Broomrape: Orobanche uniflora (Synonyms: Aphyllon uniflorum, Orobanche porphyrantha, Orobanche purpurea, Orobanche sedii, Orobanche terrae-novae, Orobanche uniflora ssp. occidentalis, Orobanche uniflora var. minuta, Orobanche uniflora var. occidentalis, Orobanche uniflora var. purpurea, Orobanche uniflora var. sedii, Orobanche uniflora var. terrae-novae, Orobanche uniflora var. typica, Thalesia uniflora) - The flowers are atop long pedicels from 3-25 cm long and which lack bractlets. 1-3 yellowish to purplish flowers may be present. The calyx lobes are longer than the calyx-tube.