| Name | Thesium costatum A. W. Hill |
| Authorship | A. W. Hill |
| Rank | Species |
| Placed in | Thesium |
| Contains | Thesium costatum var. juniperinum A. W. Hill |
| Citation | 1915 Bull. Misc. Inform. Kew 1915: 25 |
| Holdings | 5 Specimens held in the Harvard University Herbaria identified as Thesium costatum A. W. Hill |
| Identification made in | [no date] (5) |
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