| Name | Plagiobothrys cognatus (Greene) I. M. Johnston |
| Authorship | (Greene) I. M. Johnston |
| Rank | Species |
| Placed in | Plagiobothrys |
| Citation | 1932 Contr. Arnold Arbor. 3: 59 |
| Holdings | 5 Specimens held in the Harvard University Herbaria identified as Plagiobothrys cognatus (Greene) I. M. Johnston |
| Identification made in | [no date] (5) |