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long-spur violet, violette rostrée

pioneer violet, smooth yellow violet, stream or smooth yellow or yellow wood or wood or smooth yellow woodland violet, stream violet, violette glabre, yellow wood violet

Habit Plants perennial, caulescent, not stoloniferous, 5–20 cm. Plants perennial, caulescent, not stoloniferous, 3–38 cm.
Stems

1–7, ascending to erect (often declining during anthesis), glabrous, on caudex from fleshy rhizome.

1–3, erect or prostrate, leafless proximally, leafy distally, glabrous or finely puberulent, on caudex from fleshy rhizome.

Leaves

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.

basal and cauline;

basal: 0–4(–7);

stipules ovate to obovate, margins entire, crenate, or serrate, usually glandular, apex acute to obtuse;

petiole 7–27.5 cm, glabrous or puberulent;

blade usually reniform to ovate, sometimes orbiculate, 3.3–8.5 × 2–9.3 cm, base cordate, margins crenate to serrate, ciliate or eciliate, apex acute to obtuse, mucronulate, surfaces glabrous or finely puberulent;

cauline similar to basal except: usually restricted to distal ends of naked stems;

stipules ovate to oblong, margins erose or subserrate, often glandular, apex acute to acuminate;

petiole 0.2–2.9 cm, glabrous or finely puberulent;

blade ovate to deltate, 1.4–5.7 × 0.8–4.7 cm, base cordate to truncate, margins crenate to ± serrate, ciliate (sometimes limited to proximal half), apex acute.

Peduncles

5–9 cm, usually glabrous.

2–8 cm, glabrous or pubescent.

Flowers

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.

sepals linear-lanceolate, margins eciliate, auricles 0.5–1 mm;

petals deep lemon-yellow on both surfaces, lower 3 and sometimes upper 2 brownish purple-veined, lateral 2 bearded, lowest 6–18 mm, spur yellow to greenish, gibbous, 0.5–2 mm;

style head bearded; cleistogamous flowers axillary.

Capsules

ellipsoid, 4–6 mm, glabrous.

ovoid to ellipsoid, 7–13 mm, glabrous.

Seeds

beige to bronze, 1.3–2 mm.

light to dark brown, shiny, 2–2.2 mm.

2n

= 20.

= 24.

Viola rostrata

Viola glabella

Phenology Flowering Apr–May. Flowering Mar–Aug.
Habitat Rich, mesic to dry, well-drained woodlands, mountains Damp, wet, or shady places in forests, stream banks
Elevation 200–1800 m (700–5900 ft) 0–2600 m (0–8500 ft)
Distribution
from FNA
AL; CT; GA; IN; KY; MA; MD; MI; NC; NJ; NY; OH; PA; SC; TN; VA; VT; WI; WV; ON; QC; e Asia (Japan)
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; CA; ID; MT; OR; WA; AB; BC; Asia
[WildflowerSearch map]
[BONAP county map]
Discussion

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.)

Viola glabella is similar in overall appearance to V. pubescens. The cauline leaves are sometimes described as appearing only near the apex of the stem (P. A. Munz 1959), but often a leaf occurs from a node on the stem below the apex.

Viola californica was described from collections made in Humboldt and Trinity counties, California, and may have arisen as a hybrid between V. glabella and V. lobata var. integrifolia. It is apparently limited to Abies concolor forests above 1520 m (M. S. Baker 1953). Study of V. californica is needed to determine if taxonomic recognition is warranted.

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

Source FNA vol. 6, p. 154. FNA vol. 6, p. 131.
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. 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
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. 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. 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 Lophion rostratum V. californica, V. canadensis var. sitchensis, V. glabella var. remotifolia
Name authority Pursh: Fl. Amer. Sept. 1: 174. (1813) Nuttall: in J. Torrey and A. Gray, Fl. N. Amer. 1: 142. (1838)
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