| Polemoniaceae | |
Collomia grandiflora fo. axillaris
| (A. Nelson) Wherry | Amer. Midl. Naturalist 31: 223 | 1944 |
| Polemoniaceae | |
Collomia grandiflora var. axillaris
| A. Nelson | Bot. Gaz. 52(4): 270 | 1911 |
| Polemoniaceae | |
Collomia grandiflora fo. cryptantha
| Wherry | Amer. Midl. Naturalist 31: 223 | 1944 |
| Polemoniaceae | |
Collomia grandiflora fo. diffusa
| (Mulford) Wherry | Amer. Midl. Naturalist 31: 223 | 1944 |
| Polemoniaceae | |
Collomia grandiflora var. diffusa
| (Mulford) Piper | Contr. U.S. Natl. Herb. 11: 465 | 1906 |
| Polemoniaceae | |
Collomia grandiflora var. grandiflora
| | | |
| Polemoniaceae | |
Collomia grandiflora fo. scabra
| (Greene) Wherry | Amer. Midl. Naturalist 31: 226 | 1944 |
| Polemoniaceae | |
Collomia grandiflora fo. tenuiflora
| (Benth.) Wherry | Amer. Midl. Naturalist 31: 223 | 1944 |
| Polemoniaceae | |
Collomia grandiflora var. tenuiflora
| Benth. | Prodr. 9: 308 | 1845 |