Viola sororia var. sororia
Read about Viola sororia var. sororia in the Standard Cyclopedia of Horticulture
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Viola septentrionalis, Greene. Scapes and lvs. more or less hirsutulous: lvs. ovate to reniform, cordate at base, somewhat attenuate but blunt at the apex, crenate-toothed and ciliate, the petioles slender: fls. large, of a rich violet-purple (rarely white or whitish); 3 lowest petals villous at base; sepals ovate and usually obtuse; cleistogamous fls. on ascending peduncles. Newf. and westward along the Canadian border, to Brit. Col. and southward to Conn.—Albino forms, varying all the way to pure white, occur in New England.
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Read about Viola sororia var. sororia in the Standard Cyclopedia of Horticulture
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Viola pratincola, Greene. A prairie species of the Middle West, from Ind. to Minn. and Colo.; like V. papilionacea, but less robust, and often united with that species: petals violet-purple but of a lighter shade than in No. 17, the petals broadly obovate.
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Read about Viola sororia var. sororia in the Standard Cyclopedia of Horticulture
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Viola papilionacea, Pursh (V. cucullata of older Manuals). Figs. 3935-6, 3942. Commonest and most variable violet in the N. E. U. S. A robust plant, with a strong branching horizontal rootstalk, 3-6 in. high: lvs. deltoid-ovate to cordate-ovate, not lobed, bluntish, serrate, the long petiole somewhat pubescent: fls. normally deep violet but white or greenish yellow in the center; outer sepals ovate-lanceolate; petals narrow; spurred petal often narrow and boat-shaped; cleistogamous fls. usually underground but caps. erect. V. Priceana, Pollard, is probably a form of this, with white blue-centered fls. Ky. See remarks on p. 3473. —Besides albinos there are striped and pied forms now in the trade known as vars. striata, picta, and variegata, Hort. All forms are easily colonized in the garden. G.M.57:313. G.3:323 (both as V. cucullata). Gt.l:194.
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