Viola arvensis |
Viola quercetorum |
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European field violet, European field-pansy, field pansy, field violet, pansy, violette des champs, wild pansy |
goosefoot violet, goosefoot yellow violet, oakwoods violet |
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Habit | Plants annual, caulescent, not stoloniferous, 5–35 cm. | Plants perennial, caulescent, not stoloniferous, 4–25(–34.5) cm. |
Stems | 1–5, usually erect, sometimes prostrate or decumbent, branched, subglabrous or puberulent, clustered on taproot. |
1–5, spreading to erect, leafy proximally and distally, usually elongated by end of season, puberulent to canescent, on caudex from subligneous rhizome. |
Leaves | cauline; stipules palmately lobed, middle lobe oblanceolate, obovate, elliptic, or lanceolate, ± equaling leaf blade, proximal lobes dissected, shorter, margins ciliate, apex acute to obtuse; petiole 0.5–2.3 cm, glabrous or puberulent; blade: proximal ovate to ± oblong, distal narrowly or broadly lanceolate, 0.8–3.4 × 0.3–1.9 cm, base attenuate to ± truncate, margins coarsely crenate-serrate, ciliate or eciliate, apex acute to obtuse, surfaces pubescent abaxially, at least on major veins, glabrous adaxially. |
basal and cauline; basal: 1–6; stipules adnate to petiole, forming 2 linear, membranous wings, each wing with lanceolate to ± deltate projection, margins entire or laciniate, apex usually long-acuminate or divided into narrow, filiform processes; petiole 1.9–9.5 cm, puberulent; blade usually grayish green to whitish, sometimes ± purple-tinted abaxially, green to grayish green adaxially, ± ovate to ± orbiculate, deltate, pandurate, or broadly brownish purple abaxially, lower 3 dark brown-veined, lateral 2 sparsely to densely bearded, lowest 10–16 mm, spur yellow to reddish brown, gibbous, 1–2 mm; style head bearded; cleistogamous flowers axillary. |
Peduncles | 2–8 cm, glabrous or pubescent. |
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Flowers | sepals lanceolate, margins ciliate or eciliate, auricles 2–4 mm; petals white to pale yellow on both surfaces, upper 2 ± violet, lower 3 with yellow basal area, often violet-veined, lateral 2 bearded, ± equaling or shorter than sepals, lowest with dark yellow area basally, 7–15 mm, spur blue-violet to purple, elongated, 3–5 mm; style head bearded; cleistogamous flowers absent. |
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Capsules | ± spherical, 5–9 mm, glabrous. |
ovoid to ellipsoid, 8–12 mm, puberulent. |
Seeds | brown, 1.5–1.9 mm. |
medium brown, ± 2.7 mm. |
2n | = 34. |
= 24. |
Viola arvensis |
Viola quercetorum |
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Phenology | Flowering May–Jul. | Flowering Feb–Jul. |
Habitat | Abandoned fields, roadsides, lawns | Dry, grassy or brushy slopes, chaparral, in or lower than yellow pine forests |
Elevation | 0–3000 m (0–9800 ft) | 300–2000 m (1000–6600 ft) |
Distribution |
CA; CT; DC; DE; GA; ID; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; NE; NH; NJ; NY; OH; OR; PA; RI; SC; TN; UT; VA; VT; WA; WI; WV; AB; BC; MB; NB; NL; NS; ON; PE; QC; SK; SPM; Asia (Siberia); Greenland; Europe; Africa [Introduced in North America]
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CA; OR |
Discussion | A. R. Clapham et al. (1987) noted that Viola arvensis is pollinated by insects and is often selfed; T. Marcussen and T. Karlsson (2010) stated that V. arvensis regularly self-pollinates. Roots of V. arvensis have the odor of wintergreen when crushed (A. E. Radford et al. 1968; W. J. Hayden and J. Clough 1990). Viola arvensis is not vegetatively distinguishable from V. tricolor var. tricolor. G. Halliday (pers. comm.) reported that Viola arvensis occurs in southwestern Greenland, where it is introduced, and is ephemeral on St. Pierre and Miquelon. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Herbarium specimens of Viola quercetorum and V. purpurea var. purpurea can be difficult to distinguish; pressing obliterates the undulate leaf margins of V. quercetorum. In Oregon, most collections of V. quercetorum are from yellow pine forests (A. Liston, pers. comm.). Viola quercetorum hybridizes with V. douglasii (J. Clausen 1964). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 6, p. 121. | FNA vol. 6, p. 153. |
Parent taxa | Violaceae > Viola | Violaceae > Viola |
Sibling taxa | ||
Synonyms | Mnemion arvense, V. tricolor var. arvensis | V. purpurea subsp. quercetorum |
Name authority | Murray: Prodr. Stirp. Gott., 73. (1770) | M. S. Baker & J. C. Clausen: Leafl. W. Bot. 5: 101. (1948) |
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