| Name | Grindelia squarrosa f. angustior Steyermark |
| Authorship | Steyermark |
| Rank | Forma |
| NomenclaturalStatus | NomLeg |
| Placed in | Grindelia squarrosa (Pursh) Dunal |
| GUID | urn:lsid:ipni.org:names:292359-2 |
| Citation | 1934 Ann. Missouri Bot. Gard. 21: 481 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Grindelia squarrosa f. angustior Steyermark |
| Identification made in | 1933 (1), 1983 (1) |
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