| Author | (L.) Dumortier | |
| Distribution | Verified from only 2 collections: Polk County in 1922 and Robeson County in 1959.
Native of Eurasia; in N.A. throughout the U.S. and southern Canada; AK. | |
| Abundance | Very rare. | |
| Habitat | "dry earth" (Polk Co.), along railroad (Robeson Co.). | |
| Phenology | Flowering and fruiting April-June. | |
| Identification | Hare's-ear Mustard typically grows 1-2 feet tall. The basal leaves are lance-shaped or oblanceolate, blunt, not lobed or toothed. The stem leaves are similar but deeply clasp the stem with auriculate bases. Middle and upper stem leaves resemble those of Brassica rapa, but are blunt tipped; also, the petals are white (vs. yellow in Brassica) and the pods are much longer and thicker. | |
| Taxonomic Comments | A synonym is Brassica orientalis.
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| Other Common Name(s) | | |
| State Rank | SE | |
| Global Rank | GNR | |
| State Status | | |
| US Status | | |
| USACE-agcp | | |
| USACE-emp | | |
