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FNA | Family List | FNA Vol. 6 | Violaceae | Viola

55. Viola rostrata Pursh, Fl. Amer. Sept. 1: 174. 1813.

Long-spurred violet, violette rostrée Long-spurred violet, violette rostrée

Lophion rostratum (Pursh) Nieuwland & Kaczmarek

Plants perennial, caulescent, not stoloniferous, 5–20 cm. Stems 1–7, ascending to erect (often declining during anthesis), glabrous, on caudex from fleshy rhizome. Leaves basal and cauline; basal: 1–5; stipules lanceolate, margins laciniate, apex acute; petiole 1–9.6 cm, glabrous; blade sometimes purple-spotted abaxially and/or adaxially, reniform to ovate, 1–4.5 × 1–4 cm, base broadly cordate to cordate, margins crenate to serrate, mostly eciliate, apex obtuse to acute, surfaces usually pubescent, mostly adaxially toward base, sometimes glabrous; cauline similar to basal except: petiole 0.4–4 cm; distal cauline blades ovate to deltate, 1–4.5 × 1–4 cm, base cordate, apex acuminate to acute. Peduncles 5–9 cm, usually glabrous. Flowers: sepals lanceolate, margins eciliate, auricles 1–2 mm; petals pale lavender-violet on both surfaces, all white basally, lower 3 purple-black-veined, all beardless, lowest 8–20 mm, spur white, purple, or lavender-tinged, elongated, 10–20 mm; style head beardless; cleistogamous flowers axillary. Capsules ellipsoid, 4–6 mm, glabrous. Seeds beige to bronze, 1.3–2 mm. 2n = 20.

Flowering Apr–May. Rich, mesic to dry, well-drained woodlands, mountains; 200–1800 m; Ont., Que.; Ala., Conn., Ga., Ind., Ky., Md., Mass., Mich., N.J., N.Y., N.C., Ohio, Pa., S.C., Tenn., Vt., Va., W.Va., Wis.; e Asia (Japan).

Viola rostrata has the longest spur of any North American Viola species.

Viola rostrata reportedly hybridizes with V. labradorica (= V. ×malteana House) and V. striata (= V. ×brauniae Grover ex Cooperrider).


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