| Name | Iris missouriensis f. angustispatha R. C. Foster |
| Authorship | R. C. Foster |
| Rank | Forma |
| Placed in | Iris missouriensis Nuttall |
| Citation | 1937 Contr. Gray Herb. 119: 67–68 |
| Holdings | 6 Specimens held in the Harvard University Herbaria identified as Iris missouriensis f. angustispatha R. C. Foster |
| Identification made in | [no date] (6) |
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