Viola walteri |
Viola guadalupensis |
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prostrate blue violet |
Guadalupe Mountains violet, Guadalupe violet |
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Habit | Plants perennial, caulescent, stoloniferous, 5–19 cm; stolons green or reddish, leafy, sometimes rooting at nodes, becoming lignified in age. | Plants perennial, caulescent, not stoloniferous, 1–10 cm. | ||||
Stems | 1–5, prostrate, spreading, finely 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. |
1–5, decumbent to erect, leafy proximally and distally, glabrous, on caudex from fleshy rhizome. |
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Leaves | basal and cauline; basal: 3–6; stipules lanceolate, margins laciniate, projections often long-filamentous, apex long-acuminate; petiole 2.3–7.3 cm, glabrous or pubescent; blade often purple-spotted abaxially and/or adaxially, ovate to reniform, 1.2–5 × 1.6–3.6 cm, base deeply to broadly cordate, margins crenulate to serrate, ciliate or eciliate, apex rounded to obtuse, surfaces glabrous or pubescent; cauline similar to basal except: stipules ovate to lanceolate, margins laciniate; petiole 1–3.5 cm; blade 1.3–2.9 × 1.4–3.2 cm. |
cauline; stipules lanceolate to ovate- or oblong-lanceolate or linear, margins sparingly glandular-fimbriate, apex acute; petiole 2–6 cm, glabrous; blade ovate to ovate-deltate or ovate-lanceolate, 1.2–2.4 × 0.7–1.3 cm, base broadly cuneate to rounded or truncate, margins entire or with 1–3 crenations on proximal 1/2, eciliate, apex acute to rounded, surfaces glabrous, sometimes with a few short hairs on veins abaxially. |
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Peduncles | 5–9.6 cm, glabrous or pubescent. |
3.5–6 cm, glabrous. |
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Flowers | sepals lanceolate to ovate, margins mostly eciliate, auricles 0.5–1 mm; petals pale to bluish violet on both surfaces, lower 3 white basally and darker violet-veined, lateral 2 and often upper 2 and lowest bearded, lowest 15–18 mm, spur white, gibbous to usually elongated, 3–5 mm; style head bearded; cleistogamous flowers axillary. |
sepals linear to linear-lanceolate, margins eciliate, auricles 0.5–1.5 mm; petals deep lemon-yellow adaxially, upper 2 reddish brown abaxially, lateral 2 and lowest dark brown-veined basally, lateral 2 bearded, lowest 7–11 mm, spur yellow, gibbous, 1–1.4 mm; style head bearded; cleistogamous flowers absent. |
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Capsules | ovoid to ellipsoid, 5–7 mm, glabrous. |
ovoid, 3–4.5 mm, glabrous. |
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Seeds | brown, 1–1.5 mm. |
light brown, ± 2 mm. |
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2n | = 20. |
= 24. |
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Viola walteri |
Viola guadalupensis |
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Phenology | Flowering May. | |||||
Habitat | Openings and narrow ledges on limestone rock faces | |||||
Elevation | 2600 m (8500 ft) | |||||
Distribution |
AL; AR; FL; GA; KY; LA; MD; MS; NC; OH; PA; SC; TN; TX; VA; WV
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TX |
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Discussion | Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Viola guadalupensis is known only from the eastern rim of the Guadalupe Mountains in Culberson County. Powell and Wauer noted that it is the only yellow-flowered violet known in the Guadalupe Mountains and appears to be related to V. nuttallii and V. vallicola. K. W. Allred (2008) stated that a report of this species in New Mexico by J. T. Kartesz and C. A. Meacham (1999) requires verification. K. Haskins (pers. comm.) reported that experiments are currently being conducted to propagate plants of V. guadalupensis via cell tissue culture. Chloroplast (trnL-F spacer) and low-copy nuclear gene (GPI) phylogenies indicate that Viola guadalupensis is an alloploid that originated through hybridization between an unidentified member of subsect. Canadenses (the paternal parent) and a member of the V. nuttallii complex (the maternal parent), of sect. Chamaemelanium (T. Marcussen et al. 2011). Evidence reported by these authors from a fossil-calibrated relaxed clock dating analysis showed the estimated maximum age of V. guadalupensis to be (5.7–)8.6(–11.6) million years. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 6, p. 163. | FNA vol. 6, p. 132. | ||||
Parent taxa | Violaceae > Viola | Violaceae > Viola | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Name authority | House: Torreya 6: 172. (1906) | A. M. Powell & Wauer: Sida 14: 1, fig. 1. (1990) | ||||
Web links |