Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Genus Description - Sep erect, saccate at base; pet long-clawed, bright yellow to nearly white; short stamens subtended by a U -shaped gland; ovary cylindric, gradually tapering to the short style; ovules many; stigma capitate; fr elongate, slender, many- seeded, terete or 4-angled, tapering to a short beak; seeds in 1 row in each locule, oblong, granular-roughened; annual or biennial glabrous herbs, often glaucous; lvs entire, at least the upper cordate-clasping. 6, w. Eurasia, Mediterranean.
hare's ear mustard