Viola bakeri |
Viola japonica |
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Baker's violet, yellow prairie violet |
Japanese violet |
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Habit | Plants perennial, caulescent, not stoloniferous, 3–30 cm. | Plants perennial, acaulescent, not stoloniferous, 3–10 cm; rhizome thick, fleshy. |
Stems | 1–4, usually erect, sometimes prostrate or decumbent, leafy proximally and distally, usually puberulent, from usually vertical, subligneous rhizome. |
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Leaves | basal and cauline; basal: 1–4; stipules adnate to petiole, forming 2 linear-lanceolate wings, margins entire, apex of each wing free, acute to acuminate; petiole 1–15.4 cm, glabrous or puberulent; blade lanceolate, oblanceolate, or elliptic, rarely ovate, 1.8–8.8 × 0.7–3.9 cm, thin, base attenuate, often oblique, margins usually entire, sometimes with a few sharp teeth or crenulate, ciliate, apex acute to obtuse, mucronulate, surfaces glabrous or puberulent on margins or veins; cauline similar to basal except: stipules ovate to lanceolate, margins entire or lacerate, sometimes with glandular projections, apex with 2–3 projections; petiole 1.5–7.5 cm; blade 1.9–6.7 × 0.5–1.6 cm. |
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 | 1.5–11.6 cm, glabrous or pubescent. |
3–6 cm, glabrous or pubescent, bracteoles near middle. |
Flowers | sepals lanceolate, margins eciliate, auricles 0.5–1 mm; petals deep lemon-yellow adaxially, upper 2 often brownish purple abaxially, lower 3 dark brown- to brownish purple-veined, lateral 2 sparsely bearded, lowest 6–14 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 to ovoid, 5–10 mm, usually glabrous, rarely finely puberulent. |
ellipsoid, 8–10 mm, glabrous. |
Seeds | light to medium brown or dark red-brown, 2.6–3.1 mm, elaiosome not covering funiculus. |
unknown. |
Gardens | and ruderal areas; 10–50 m; introduced; Mass.; Asia (China, Japan, Korea). |
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2n | = 48. |
= 48.Flowering Apr–Jun. |
Viola bakeri |
Viola japonica |
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Phenology | Flowering May–Jul. | Flowering Apr–Jun. |
Habitat | Wet and dry places in openings of coniferous forests | Gardens and ruderal areas |
Elevation | 900–3800 m (3000–12500 ft) | 10–50 m (0–200 ft) |
Distribution |
CA; NV; OR; WA
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MA; Asia (China, Japan, Korea) [Introduced in North America] |
Discussion | M. S. Baker (1957) wrote that Viola bakeri flowers were often without a brownish tinge on the back. Subsequent collections have shown that the upper two petals of V. bakeri are often brownish purple abaxially and thus this characteristic cannot be used to distinguish V. bakeri from V. praemorsa, as previously done (P. A. Munz 1959; C. L. Hitchcock et al. 1955–1969, vol. 3). Greene wrote in his description of Viola bakeri that the whole plant was glabrous; he did not mention leaf margins. M. S. Baker (1957) examined the type specimen at UC and apparently was the first to document that its leaf margins are entire. He also noted that under magnification the leaves are ciliate and more or less puberulent. D. M. Fabijan et al. (1987) stated that margins were always entire and ciliate and more or less pubescent throughout. Some collections of V. bakeri from California have leaves with a sharp point or two on the margin, or crenulations on some portion of the basal or cauline blade margins. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 6, p. 121. | FNA vol. 6, p. 134. |
Parent taxa | Violaceae > Viola | Violaceae > Viola |
Sibling taxa | ||
Synonyms | V. bakeri subsp. shastensis, V. nuttallii var. bakeri | |
Name authority | Greene: Pittonia 3: 307. (1898) | Langsdorff ex Gingins: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 1: 295. (1824) |
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