| Name | Crepis occidentalis subsp. costata (A. Gray) Babcock & Stebbins |
| Authorship | (A. Gray) Babcock & Stebbins |
| Rank | Subspecies |
| Placed in | Crepis occidentalis Nuttall |
| Holdings | 17 Specimens held in the Harvard University Herbaria identified as Crepis occidentalis subsp. costata (A. Gray) Babcock & Stebbins |
| Identification made in | [no date] (12), 2010 (1), 2014 (4) |
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