Viola lobata |
Viola nuttallii |
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moose horn violet, pine violet, yellow wood violet |
Nuttall's or Nuttall's yellow or yellow prairie violet, Nuttall's violet, violette de Nuttall, yellow prairie violet |
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Habit | Plants perennial, caulescent, not stoloniferous, 5–46 cm. | Plants perennial, caulescent, not stoloniferous, 2–27 cm. | ||||
Stems | 1–3, erect, leafless proximally, leafy distally, glabrous or puberulent, from subligneous rhizome. |
1–6, ascending to erect, leafy proximally and distally, ca. 1/2 subterranean, puberulent, on caudex from usually vertical, subligneous rhizome. |
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Leaves | basal and cauline; basal: 0–2, unlobed or palmately 3–11-lobed; stipules ovate to lanceolate, margins ± entire or serrate, apex acute; petiole 5–27 cm, glabrous or puberulent; blade sometimes glaucous, deltate to reniform, 3.5–8.5 × 4.5–13.5 cm, base cordate, truncate, or attenuate, margins on unlobed leaves coarsely dentate-serrate, margins on lobed leaves usually entire, sometimes few-toothed, ciliate (sometimes only proximal 1/2) or eciliate, apex acute to obtuse, mucronulate, surfaces glabrous or puberulent; cauline similar to basal except: distal on naked stems, unlobed and divided leaves can occur on same plant, if divided, palmately 3–12-lobed; stipules sometimes large and ± leaflike, margins entire, lacerate, or laciniate, sometimes with gland-tipped projections, apex acute to acuminate; petiole 0.2–8.8 cm; blade reniform to reniform-cordate, ± ovate, deltate, or rhombic, 1.5–5.5 × 1.4–10 cm, base cordate, subcordate, truncate, or attenuate, margins entire, crenate-serrate, or dentate, or coarsely lacerate to deeply serrate, often entire distally, ciliate or rarely eciliate, apex acute to obtuse, often long-tapered, mucronulate. |
basal and cauline; basal: 1–6; stipules adnate to petiole, forming 2 linear-lanceolate wings, margins entire, apex of each wing free, acute, few-toothed or lobed; petiole 2–17 cm, glabrous or minutely puberulent; blade lanceolate, ovate, or elliptic, 1–9 × 0.6–2.5 cm, base attenuate, margins entire or serrulate, sometimes sinuate, ciliate, apex acute to obtuse, mucronulate, surfaces glabrous or puberulent; cauline similar to basal except: stipules adnate to or free from petiole, linear to linear-lanceolate or linear-oblong, sometimes leaflike, margins usually entire, rarely laciniate or glandular, apex acute to acuminate; petiole 2–7 cm; blade 1.4–7.2(–10) × 1.1–2.3 cm, length 1.3–4.4 times width, apex acute. |
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Peduncles | 2–13 cm, glabrous or pubescent. |
3–13 cm, glabrous or puberulent. |
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Flowers | sepals lanceolate, margins ciliate or eciliate, auricles 0.1–1 mm; petals deep lemon-yellow adaxially, usually upper 2 and sometimes lateral 2 brownish purple abaxially, lower 3 and sometimes upper 2 brownish purple-veined basally, lateral 2 bearded, lowest 8–19 mm, spur yellow to greenish, gibbous, 0.5–2 mm; style head bearded; cleistogamous flowers axillary. |
sepals linear-lanceolate, margins eciliate, auricles 0.5–1 mm; petals deep lemon-yellow adaxially or on both surfaces, upper 2 often brownish purple abaxially, lower 3 dark brown- to brownish purple-veined, lateral 2 sparsely bearded, lowest 6–13 mm, spur yellow, gibbous, 0.5–1.5 mm; style head bearded; cleistogamous flowers axillary. |
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Capsules | ellipsoid-ovoid, 6–16 mm, glabrous. |
subglobose to ovoid, 4–10 mm, usually glabrous, rarely finely puberulent. |
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Seeds | light brown, blotched or streaked with brown, shiny, 2.1–2.7 mm. |
medium brown, 2–3.2 mm, elaiosome extending over 1/3 length of seed and completely covering funiculus. |
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2n | = 12. |
= 24. |
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Viola lobata |
Viola nuttallii |
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Phenology | Flowering Apr–Jun. | |||||
Habitat | Sagebrush flats, prairie grasslands, dry stream banks, juniper woodlands, scree slopes | |||||
Elevation | 400–2600 m (1300–8500 ft) | |||||
Distribution |
CA; OR; nw Mexico
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AZ; CO; ID; KS; MN; MT; ND; NE; NM; SD; UT; WY; AB; MB; SK
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Discussion | Varieties 2 (2 in the flora). V. B. Baird (1942) noted that Viola lobata was more closely related to V. tripartita than to any western Viola. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
D. M. Fabijan et al. (1987) stated that Viola nuttallii showed no evidence of hybridization even when growing with V. vallicola east of the Rocky Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 6, p. 137. | FNA vol. 6, p. 140. | ||||
Parent taxa | Violaceae > Viola | Violaceae > Viola | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Crocion nuttallii | |||||
Name authority | Bentham: Pl. Hartw., 298. (1849) | Pursh: Fl. Amer. Sept. 1: 174. (1813) | ||||
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