Viola bakeri |
Viola rostrata |
|
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Baker's violet, yellow prairie violet |
long-spur violet, violette rostrée |
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Habit | Plants perennial, caulescent, not stoloniferous, 3–30 cm. | Plants perennial, caulescent, not stoloniferous, 5–20 cm. |
Stems | 1–4, usually erect, sometimes prostrate or decumbent, leafy proximally and distally, usually puberulent, from usually vertical, subligneous rhizome. |
1–7, ascending to erect (often declining during anthesis), glabrous, on caudex from fleshy rhizome. |
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 and cauline; basal: 1–5; stipules lanceolate, margins laciniate, apex acute; petiole 1–9.6 cm, glabrous; blade sometimes purple-spotted abaxially and/or adaxially, reniform to ovate, 1–4.5 × 1–4 cm, base broadly cordate to cordate, margins crenate to serrate, mostly eciliate, apex obtuse to acute, surfaces usually pubescent, mostly adaxially toward base, sometimes glabrous; cauline similar to basal except: petiole 0.4–4 cm; distal cauline blades ovate to deltate, 1–4.5 × 1–4 cm, base cordate, apex acuminate to acute. |
Peduncles | 1.5–11.6 cm, glabrous or pubescent. |
5–9 cm, usually glabrous. |
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 lanceolate, margins eciliate, auricles 1–2 mm; petals pale lavender-violet on both surfaces, all white basally, lower 3 purple-black-veined, all beardless, lowest 8–20 mm, spur white, purple, or lavender-tinged, elongated, 10–20 mm; style head beardless; cleistogamous flowers axillary. |
Capsules | spherical to ovoid, 5–10 mm, usually glabrous, rarely finely puberulent. |
ellipsoid, 4–6 mm, glabrous. |
Seeds | light to medium brown or dark red-brown, 2.6–3.1 mm, elaiosome not covering funiculus. |
beige to bronze, 1.3–2 mm. |
2n | = 48. |
= 20. |
Viola bakeri |
Viola rostrata |
|
Phenology | Flowering May–Jul. | Flowering Apr–May. |
Habitat | Wet and dry places in openings of coniferous forests | Rich, mesic to dry, well-drained woodlands, mountains |
Elevation | 900–3800 m (3000–12500 ft) | 200–1800 m (700–5900 ft) |
Distribution |
CA; NV; OR; WA
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AL; CT; GA; IN; KY; MA; MD; MI; NC; NJ; NY; OH; PA; SC; TN; VA; VT; WI; WV; ON; QC; e Asia (Japan)
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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.) |
Viola rostrata has the longest spur of any North American Viola species. Viola rostrata reportedly hybridizes with V. labradorica (= V. ×malteana House) and V. striata (= V. ×brauniae Grover ex Cooperrider). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 6, p. 121. | FNA vol. 6, p. 154. |
Parent taxa | Violaceae > Viola | Violaceae > Viola |
Sibling taxa | ||
Synonyms | V. bakeri subsp. shastensis, V. nuttallii var. bakeri | Lophion rostratum |
Name authority | Greene: Pittonia 3: 307. (1898) | Pursh: Fl. Amer. Sept. 1: 174. (1813) |
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