Below is the data from CD of drawings from Curtis' Botanical Magazine.
In Pennsylvania according to Rhoads
we probably only have one species, D. meadia.
D. radicatum Green [syn. D. amethystinum (Fasset) Fasset is inconsistently different.
The information below indicates that the original drawing is of a western speices.

-PLATE- Plate No. 12

-COMMON_NAMES-Mead's Dodecatheon, American Cowslip, Shooting Star
-GENUS-Dodecatheon
-SPECIES-Dodecatheon meadia
-CLASS-Pentandria
-ORDER-Monogynia
-AUTHORITY-Linnaeus

-MODERN_GENUS-Dodecatheon
-MODERN_SPECIES-Dodecatheon cruciatum
-MODERN_FAMILY-Primulaceae
-PLANT_TYPE-perennial
-COLOR-deep red or purple, base with purple ring & yellow spots
-SEASON-spring - early summer
-NATIVE_REGION-W United States
-ZONE-6

-SOURCE-The Botanical Magazine
-VOLUME-1
-PUB_DATE-1787
-REISSUED-1793
-EDITOR-William Curtis
-ARTIST-J. Sowerby
-NALPCD-Disc 0644 IMG0010.PCD