Viola cucullata Aiton
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Glabrous, acaulescent; rhizome short, oblique or horizontal, often branching to form colonies; lvs all merely crenate-serrate, cordate at base, the blade typically held at an angle to the strongly ascending petiole, ovate to reniform at anthesis, the summer-lvs to 10 cm wide, all except the earliest acute or shortly acuminate; fls on long, slender peduncles, typically elevated well above the lvs; pet light violet to sometimes white, usually with a dark-veined eye, the 2 lateral pet densely bearded with short hairs generally well under 1 mm, many of or all the hairs strongly clavate or with a conspicuously expanded knob at the end; spurred pet glabrous, somewhat shorter than the lateral ones; cleistogamous fls long and slender, on long, erect peduncles, the auricles nearly as long as the sep; fr ovoid-cylindric, only slightly longer than the sep; seeds nearly black; 2n=54. Bogs, swamps, and other wet or moist places in shade or sun, not weedy; Nf. to Ont. and Minn., s. to N.C., Ga., Tenn., and e. Ark. Apr.–July.