Whitestem Blazingstar, White-stem Blazing-star, White-stemmed Mentzelia: Mentzelia albicaulis (Synonyms: Acrolasia albicaulis, Acrolasia gracilis, Mentzelia albicaulis var. albicaulis, Mentzelia albicaulis var. ctenophora, Mentzelia albicaulis var. gracilis, Mentzelia albicaulis var. tenerrima, Mentzelia gracilis, Mentzelia mojavensis, Trachyphytum gracile) - Plants annual with petals less than 1.5 cm long. Floral bracts entire. Flower clusters not leafy.
United Blazingstar, White-bracted Mentzelia: Mentzelia congesta (Synonym: Mentzelia congesta var. davidsoniana) -
Bush Mentzelia, Bushy Blazing-star, Small-flowered Mentzelia: Mentzelia dispersa (Synonyms: Mentzelia dispersa var. compacta, Mentzelia dispersa var. dispersa, Mentzelia dispersa var. latifolia, Mentzelia dispersa var. obtusa) - Plants annual with petals less than 1.5 cm long. Flowers in leafy clusters. Basal leaves less than 10 cm long with entire to lobed margins. Stem leaves entire to dentate. Floral bracts ovate or tapered from middle to tip with entire to lobed margins. Sepals 1-3.5 mm long. Fruits 7-25 mm long, 1-2.5 mm wide and straight or curved less than 30 degrees.
Blazingstar Mentzelia, Blazing-star Mentzelia, Great Mentzelia, Smoothstem Blazingstar: Mentzelia laevicaulis var. laevicaulis (Synonyms: Mentzelia laevicaulis var. acuminata, Nuttallia laevicaulis) - Plants biennial or perennial with petals about 5 cm long. Fruits typically greater than 25 mm long.
Smooth Mentzelia, Soft Blazingstar: Mentzelia mollis -
Variegated-bract Blazingstar: Mentzelia montana (Synonym: Acrolasia montana) - Plants annual with yellow petals 2-7 mm long, often with an orange spot at the base. Stem leaves up to 13 cm long, entire or 2-lobed at base. Floral bracts 2-6 toothed or lobed and whitish at base, ovate in shape. Styles 1.5-3 mm.
Packard's Blazingstar: Mentzelia packardiae - Found along the Owyhee River in Malheur County, OR
Veatche's Mentzelia, Veatch's Stickleaf, Whitestem Blazingstar: Mentzelia veatchiana (Synonyms: Mentzelia albicaulis var. veatchiana, Mentzelia gracilenta var. veatchiana) - Plants annual with yellow to orange petals 4-8 cm long. Floral bracts toothed or lobed. Basal leaves 1-18 cm long and deeply lobed, the lobes further toothed. Stem leaves are toothed or lobed. Floral bracts ovate to obovate, toothed with whitish base. Sepals 1-5 mm long. Fruits 8-28 mm long and typically straight or occasionally curved up to 70 degrees.