Schneider & Benton (2021) split A. franciscanum away from A. fasciculatum. The two look fairly similar, but have somewhat non-overlapping ranges and different host preferences. Here's the key couplet separating them in that paper:

Inflorescence corymbose (fully developed flowers at similar heights); plant various hues of pink from pale to deep reddish pink; corolla lobe apex rounded; corolla tube usually bent 45 degrees or more from vertical (but rarely as little as 25 degrees); calyx lobe tips generally uniform in tone; host Artemisia spp... A. fasciculatum

Inflorescence subcorymbose racemes (fully developed flowers at various heights); plant pale yellow to lemon yellow or purple; pedicel, calyx, and outer surface of corolla sometimes tinged purple or brown; corolla lobe apex pointed; corolla tube erect or slightly bent (usually , 45 degrees from vertical, only rarely as much as 60 degrees); calyx lobe tips sometimes darkened, especially when dry; host variable but not Artemisia spp. (Eriodictyon, Eriogonum, Phacelia most common)... A.franciscanum

See https://www.inaturalist.org/flags/543076 for discussion. Bonus, both of the authors of that paper are iNat users and used iNat observation in this research!