| Name | Isoetes butleri Engelmann |
| Authorship | Engelmann |
| Rank | Species |
| Placed in | Isoetes Linnaeus |
| Citation | 1878 Bot. Gaz. 3: 1 |
| Holdings | 27 Specimens held in the Harvard University Herbaria identified as Isoetes butleri Engelmann |
| Identification made in | [no date] (21), 2005 (6) |
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