Viola cuneata |
Viola japonica |
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northern two-eyed or wedge-leaf violet, northern two-eyed violet, wedge-leaf violet |
Japanese violet |
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Habit | Plants perennial, caulescent, not stoloniferous, 2–25 cm. | Plants perennial, acaulescent, not stoloniferous, 3–10 cm; rhizome thick, fleshy. |
Stems | 1–3, usually erect, sometimes prostrate or ascending, glabrous, from shallow, fleshy rhizome or deep-seated caudex with fleshy roots. |
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Leaves | basal and cauline; basal: 2–6; stipules lanceolate, margins entire or gland-toothed, apex acute; petiole 4.5–9.8 cm, glabrous; blade purple-veined, orbiculate-ovate to deltate, 1–4 × 2.7–3.8 cm, usually shiny, leathery, base cuneate, margins serrate, eciliate, apex acute, mucronulate, surfaces glabrous; cauline similar to basal except: stipules lanceolate to ovate, margins entire or erose to lacerate, with or without gland-tipped processes, apex acute to acuminate; petiole 0.5–20 cm; blade usually rhombic, sometimes orbiculate, 0.9–2.6 × 0.7–1.8 cm, margins crenate to ± serrate, apex acute to obtuse. |
basal, ca. 5, ascending to erect; stipules ± oblong, 2-fid, proximal margins entire, distal ± serrate, apex acuminate; petiole narrowly winged distally, 1–14 cm, usually glabrous; blade unlobed, broadly ovate or triangular-ovate, 3–8 × 3–5.5 cm, base cordate, margins crenate, usually eciliate, apex acute or ± obtuse, surfaces sparsely puberulent. |
Peduncles | 1–10.5 cm, glabrous. |
3–6 cm, glabrous or pubescent, bracteoles near middle. |
Flowers | sepals lanceolate, margins eciliate, auricles 0.5–1 mm; petals deep reddish violet abaxially, white adaxially, upper 2 sometimes with purple patch basally, lateral 2 with purple patch basally beyond smaller yellow area, usually bearded, sometimes beardless, lowest purple-veined with yellow area basally, 8–14 mm, spur yellow, gibbous, 1–2 mm; style head bearded; cleistogamous flowers axillary. |
sepals broadly lanceolate, margins eciliate, auricles 6–8 mm; petals light violet or whitish violet on both surfaces, lowest 3 occasionally white basally, often dark violet-veined, lateral 2 sparsely bearded or beardless, lowest 17–20 mm, spur pale to dark violet, elongated, 5–10 mm; style head beardless; cleistogamous flowers present. |
Capsules | ± spherical, 5–9 mm, glabrous. |
ellipsoid, 8–10 mm, glabrous. |
Seeds | deep brown-purple, 2.1–3 mm. |
unknown. |
Gardens | and ruderal areas; 10–50 m; introduced; Mass.; Asia (China, Japan, Korea). |
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2n | = 48.Flowering Apr–Jun. |
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Viola cuneata |
Viola japonica |
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Phenology | Flowering Mar–Sep. | Flowering Apr–Jun. |
Habitat | Open pine or oak forests, often serpentine soil | Gardens and ruderal areas |
Elevation | 600–2200 m (2000–7200 ft) | 10–50 m (0–200 ft) |
Distribution |
CA; OR
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MA; Asia (China, Japan, Korea) [Introduced in North America] |
Discussion | Viola cuneata often occurs on serpentine-derived soil and is closely related to V. flettii, V. hallii, and V. ocellata (V. B. Baird 1942). Originally described as beardless by Watson, the lateral petals of flowers in the same population can be prominently bearded or essentially beardless. The cauline blades of Viola cuneata are often vertical, especially early in season. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 6, p. 129. | FNA vol. 6, p. 134. |
Parent taxa | Violaceae > Viola | Violaceae > Viola |
Sibling taxa | ||
Name authority | S. Watson: Proc. Amer. Acad. Arts 14: 290. (1879) | Langsdorff ex Gingins: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 1: 295. (1824) |
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