California Tansymustard, Sierran Tansymustard: Descurainia californica -
Mountain Tansymustard: Descurainia incana (Synonyms: Descurainia richardsonii, Descurainia richardsonii var. macrosperma, Descurainia richardsonii var. richardsonii) -
Cut-leaved Tansymustard, Mountain Tansymustard: Descurainia incisa ssp. incisa (Synonyms: Descurainia incana ssp. incisa, Descurainia incana ssp. viscosa, Descurainia incisa ssp. viscosa, Descurainia richardsonii ssp. incisa, Descurainia richardsonii ssp. viscosa, Descurainia richardsonii var. sonnei, Descurainia richardsonii var. viscosa) - Leaves once pinnate. Pods linear with pointed tips and strongly constricted between seeds, ranging from 5-17 mm long. Pedicels and pods ascending to widely spreading. Plants eglandular to glandular. Found from southern British Columbia south to California (to the east of the Cascades) and east to the Rocky Mts. from Alberta to New Mexico.
Narrow Tansymustard, Thread-stalk Cutleaf Tansymustard, Western Tansymustard: Descurainia longipedicellata (Synonyms: Descurainia incisa ssp. filipes, Descurainia incisa var. filipes, Descurainia pinnata ssp. fillipes, Descurainia pinnata var. filipes, Sisymbrium incisum var. filipes, Sisymbrium longipedicellatum, Sophia filipes) - Leaves once pinnate. Pods linear, measuring 10-20 mm long and less than the length of the pedicels. Plants are eglandular. Found from British Columbia south through eastern Washington and Oregon to eastern California and east to Montana, Colorado and Nevada.
Nelson's Tansymustard, Nelson's Western Tansymustard: Descurainia nelsonii (Synonyms: Descurainia brachycarpa var. nelsonii, Descurainia pinnata ssp. nelsonii, Descurainia pinnata var. nelsonii, Sophia nelsonii) - Leaves once pinnate. Pods linear and 4-12 mm long with pedicels shorter than the pods. Plants eglandular. Found from eastern Washington to Nevada and east to Montana and Colorado.
Paradise Tansymustard, Nevada Tansymustard: Descurainia paradisa ssp. paradisa (Synonyms: Descurainia paradisa var. paradisa, Descurainia pinnata ssp. paradisa, Descurainia pinnata var. paradisa) - Leaves once pinnate. Pods narrowly elliptic, measruing from 2-4 mm long and not constricted between seeds. Plants glandular. Petals yellow, 1-1.5 mm long. Found from central Oregon to Nevada and California.
Shortpod Tansymustard, Western Tansymustard: Descurainia pinnata ssp. brachycarpa (Synonyms: Descurainia brachycarpa, Descurainia pinnata var. brachycarpa, Descurainia pinnata var. intermedia) -
Salty Western Tansymustard, Western Tansymustard: Descurainia pinnata ssp. halictorum (Synonyms: Descurainia halictorum var. andrenarium, Descurainia pinnata var. halictorum, Descurainia pinnata var. osmiarum, Sophia andrenarium, Sophia andrenarium var. osmiarum, Sophia halictorum) - Leaves once pinnate. Pods linear or linear-obovate, measuring from 5-10 mm long. Plants glandular and covered with dense, short, gray or white hairs. Flowers white to yellow, measuring up to 2 mm long. Found from southeastern Oregon to Wyoming and Mexico.
Flixweed, Herb Sophia: Descurainia sophia (Synonyms: Sisymbrium sophia, Sophia sophia) - Lower leaves bi- to tripinnate. Pods narrowly linear. Plants covered with with fine, star-like hairs that give them a grayish appearance.