Flora of North America species comparison

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Viola sempervirens

Viola odorata

evergreen violet, redwood violet, redwoods violet, trailing yellow violet, violette toujours verte

English violet, garden violet, sweet blue violet, sweet violet, violette odorante
Habit Plants perennial, caulescent, stoloniferous, 10–30 cm; stolons green or reddish, leafy, sometimes rooting at nodes, becoming lignified in age. Plants perennial, acaulescent, stoloniferous, 4–12 cm; stolons green, often rooting at nodes and forming leafy rosettes; rooted rosettes often develop into erect, rhizomatous caudex from which new stolons are produced; rhizome thick, fleshy.
Stems

1–5, prostrate, spreading, glabrous or sparsely puberulent, from current and/or previous year’s growth, on usually vertical, fleshy rhizome, rooting and forming rosettes at or near tip; rooted rosettes often develop into an erect, fleshy caudex from which new stems are produced.

Leaves

evergreen, basal and cauline;

basal: 1–6(–10);

stipules deltate to ovate or linear-lanceolate, margins entire or glandular-toothed, apex acute to long-acuminate;

petiole 2–16 cm, glabrous;

blade often purple-spotted abaxially and/or adaxially, orbiculate to ovate, 1–4.5 × 2–3.9 cm, base cordate to truncate, margins crenate, eciliate, apex blunt to obtuse, mucronulate, surfaces glabrous or with scattered bristles on one or both surfaces;

cauline similar to basal except: stipules deltate to lanceolate, margins entire or sparingly toothed;

petiole 0.3–3 cm;

blade 1.2–2.2 × 1.2–2 cm.

basal (and from stolons), 5–10, ascending to erect;

stipules lanceolate to linear-lanceolate, margins fimbriate, projections gland-tipped, apex acute;

petiole 2–17 cm, puberulent;

blade unlobed, ovate to orbiculate, 1.5–7 × 1.5–5 cm, base cordate, margins crenate, ciliate, apex obtuse to rounded, surfaces puberulent.
Peduncles

5–10 cm, glabrous.

4–15 cm, puberulent.
Flowers

sepals lanceolate to ovate-lanceolate, margins eciliate, auricles 1–2 mm;

petals lemon-yellow on both surfaces, lower 3 and sometimes upper 2 brownish purple-veined, lateral 2 bearded, lowest 8–17 mm, spur yellow or whitish, gibbous, 1–2.5 mm;

style head bearded; cleistogamous flowers axillary.

sepals narrow to broadly lanceolate, margins ciliate, auricles 3–4 mm;

petals deep to pale blue-violet, pale blue, or white on both surfaces, usually white basally, lateral 2 sparsely to densely bearded, lowest usually purple-veined, 12–22 mm, spur usually same color as petals, elongated, 5–7 mm;

style head beardless; cleistogamous flowers on prostrate or ascending peduncles.
Capsules

mottled with purple, spherical to ovoid, 5–8 mm, glabrous.

sometimes purple-flecked, ovoid, 5–8 mm, puberulent.
Seeds

brown, tinged purple, 2–2.5 mm.

brown, 3–4 mm.
2n

= 24, 48.

= 20.

Viola sempervirens

Viola odorata
Phenology Flowering Jan–Jul. Flowering Jan–May.
Habitat Redwood forests, other coastal forests, Douglas fir, other coniferous forests Lawns, roadsides, clearings, riparian habitats, parks, urban areas
Elevation 30–1400 m (100–4600 ft) 0–1700 m (0–5600 ft)
Distribution
from FNA
AK; CA; ID; OR; WA; BC
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; CT; ID; IL; MA; ME; MI; NC; NY; OH; OR; PA; RI; UT; WA; WI; BC; NS; ON; QC; Eurasia [Introduced in North America; introduced also in Australia]
[WildflowerSearch map]
[BONAP county map]
Discussion

In California, Viola sempervirens occurs in shaded redwood forests and other coastal forest habitats. In Oregon and Washington, it occurs in Douglas fir and other coniferous forests, where it can form mats (clones) one meter or more in diameter; its prostrate, spreading growth habit is similar to V. walteri. The leafy stems of V. sempervirens are similar to the leafy stolons of V. odorata.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Viola odorata occurs in small colonies; individual plants are interconnected by stolons.

The flowers of Viola odorata are noted for their fragrance; some plants are more fragrant than others. It is native to Eurasia and assumed to be introduced in North America where it is usually found in areas associated with human habitation, including parks, lawns, and roadsides. A substantial industry revolved around the commercial production of violets in England, France, and the United States from prior to 1895 and into the 1900s (R. E. Coombs 2003). Viola odorata is sometimes found in remote locations not easily explained by anthropogenic influence, for example, Clearwater Mountains, Idaho. It is available through the nursery trade and is cultivated as a garden plant and occasionally reported as an escape. Viola odorata is grown in southern France for essential oils used in perfumes, flavorings, and toiletries, and also for the production of the sweet, violet-colored liqueur called parfait amour (V. H. Heywood 1978).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 6, p. 157. FNA vol. 6, p. 140.
Parent taxa Violaceae > Viola Violaceae > Viola
Sibling taxa
V. adunca, V. affinis, V. arvensis, V. bakeri, V. beckwithii, V. bicolor, V. biflora, V. blanda, V. brittoniana, V. canadensis, V. canina, V. charlestonensis, V. clauseniana, V. cucullata, V. cuneata, V. douglasii, V. egglestonii, V. epipsila, V. flettii, V. frank-smithii, V. glabella, V. guadalupensis, V. hallii, V. hastata, V. hirsutula, V. howellii, V. japonica, V. labradorica, V. lanceolata, V. langsdorffii, V. lithion, V. lobata, V. macloskeyi, V. missouriensis, V. nephrophylla, V. novae-angliae, V. nuttallii, V. ocellata, V. odorata, V. orbiculata, V. palmata, V. palustris, V. pedata, V. pedatifida, V. pedunculata, V. pinetorum, V. praemorsa, V. primulifolia, V. prionantha, V. pubescens, V. purpurea, V. quercetorum, V. renifolia, V. riviniana, V. rostrata, V. rotundifolia, V. sagittata, V. selkirkii, V. septemloba, V. sheltonii, V. sororia, V. striata, V. subsinuata, V. tomentosa, V. tricolor, V. trinervata, V. tripartita, V. umbraticola, V. utahensis, V. vallicola, V. villosa, V. walteri
V. adunca, V. affinis, V. arvensis, V. bakeri, V. beckwithii, V. bicolor, V. biflora, V. blanda, V. brittoniana, V. canadensis, V. canina, V. charlestonensis, V. clauseniana, V. cucullata, V. cuneata, V. douglasii, V. egglestonii, V. epipsila, V. flettii, V. frank-smithii, V. glabella, V. guadalupensis, V. hallii, V. hastata, V. hirsutula, V. howellii, V. japonica, V. labradorica, V. lanceolata, V. langsdorffii, V. lithion, V. lobata, V. macloskeyi, V. missouriensis, V. nephrophylla, V. novae-angliae, V. nuttallii, V. ocellata, V. orbiculata, V. palmata, V. palustris, V. pedata, V. pedatifida, V. pedunculata, V. pinetorum, V. praemorsa, V. primulifolia, V. prionantha, V. pubescens, V. purpurea, V. quercetorum, V. renifolia, V. riviniana, V. rostrata, V. rotundifolia, V. sagittata, V. selkirkii, V. sempervirens, V. septemloba, V. sheltonii, V. sororia, V. striata, V. subsinuata, V. tomentosa, V. tricolor, V. trinervata, V. tripartita, V. umbraticola, V. utahensis, V. vallicola, V. villosa, V. walteri
Synonyms V. sarmentosa, V. sempervirens subsp. orbiculoides
Name authority Greene: Pittonia 4: 8. (1899) Linnaeus: Sp. Pl. 2: 934. (1753)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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