Viola lobata

Bentham
Pl. Hartw., 298. 1849.
Illustrated
Treatment appears in FNA Volume 6. Treatment on page 137. Mentioned on page 111, 118, 161.

Plants perennial, caulescent, not stoloniferous, 5–46 cm. Stems 1–3, erect, leafless proximally, leafy distally, glabrous or puberulent, from subligneous rhizome. 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. Peduncles 2–13 cm, glabrous or pubescent. 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. Capsules ellipsoid-ovoid, 6–16 mm, glabrous. Seeds light brown, blotched or streaked with brown, shiny, 2.1–2.7 mm. 2n = 12.

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.

Selected References

None.

Key

1 Cauline leaf blades usually deeply divided, seldom unlobed, reniform, ± ovate, or deltate, if divided, palmately 3–12-lobed, lobe margins usually entire. Viola lobata var. lobata
1 Cauline leaf blades unlobed, deltate to rhombic, ovate, or reniform-cordate, margins ± serrate, crenate-serrate, or dentate to deeply serrate or coarsely lacerate, often entire distally. Viola lobata var. integrifolia