| Name | Penstemon watsonii subsp. laxus (A. Nelson) D. D. Keck |
| Authorship | (A. Nelson) D. D. Keck |
| Rank | Subspecies |
| Placed in | Penstemon watsonii A. Gray |
| Citation | 1940 Amer. Midl. Naturalist, Monogr. 23: 610 |
Copyright © 2013 The President and Fellows of Harvard College | Accessibility