The Genus Lithophragma

1. Bulblet Prairie Star, Bulbous Woodland-star, Bulbiferous Prairie-star: Lithophragma glabrum (formerly Lithophragma bulbifera): Stems reddish. Flowers white or pink with cleft petals. Calyx cup-shaped. Reddish-purple bulblets commonly found on this species. Basal leaves often 3 lobed and divided nearly to the base.

2. Smooth Prairie Star, Bulbous Woodland-star, Bulbiferous Prairie-star: Lithophragma glabrum (formerly Lithophragma glabra): Stems reddish, somewhat hairy and glandular. Flowers white or pink, the five petals cleft or divided into thin, tattered lobes. Calyx cup-shaped. Flowers 5-15 at the top of the stem. Bulblets may be found instead of flowers. Basal leaves often 3-lobed and divided nearly to the base.

3. Small-flowered Prairie Star, Small-flowered Woodland-star, Small-flowered Prairie-star: Lithophragma parviflorum var. parviflorum (formerly Lithophragma parviflora): No bulblets present. Basal leaves deeply divided 3-5 times, but not to the base. Stem leaves compound but 3-foliate. The 5 petals white or pinkish, each with 5-7 thin lobes. Calyx long and thin, widest at the mouth and tapering gradually to the stem.

4. Slender Woodland Star: Lithophragma tenellum (formerly Lithophragma tenella) - No bulblets present. Basal leaves deeply divided, but not to the base. Calyx rounded at the base. Petals are 3-lobed at the tip.