Epilobium anagallidifolium |
Epilobium smithii |
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alpine willow-herb, pimpernel willow-herb, épilobe à feuilles de mouron |
Smith's willowherb |
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| Habit | Herbs with spreading thin, small-leafed epigeous soboles to 5 cm. | Herbs with sprawling, wiry underground soboles with brownish tan scalelike leaves, arising from semi-woody extended caudex. |
| Stems | many, ascending, often sigmoidally bent, nodding distally, later erect, clumped or mat-forming, terete, 3–20(–25) cm, simple, subglabrous, sometimes with faint raised strigillose lines decurrent from margins of petioles, rarely mixed strigillose and sparsely glandular puberulent distally. |
10–30+, ascending to erect, clumped, terete, 6–35 cm, usually simple, rarely slightly branched distally, strigillose throughout, especially on raised lines decurrent from margins of petioles, densely glandular puberulent distally. |
| Leaves | opposite and crowded proximal to inflorescence, alternate distally, petioles 1–6 mm, rarely subsessile distally; blade spatulate to oblong proximally, elliptic to narrowly lanceolate or sublinear distally, (0.5–)0.8–2.5 × 0.3–1 cm, base attenuate to cuneate, margins subentire proximally, sparsely denticulate distally with 2–5 low teeth per side, veins obscure, 2–4 per side, apex obtuse or rounded proximally to subacute distally, surfaces subglabrous; bracts reduced, usually much narrower. |
opposite proximal to inflorescence, alternate distally, petiole 0–5 mm; blade dark or grayish green, lanceolate to subovate, 1–3.8 × 0.3–1.5 cm, base attenuate proximally to rounded distally, margins low-denticulate with 4–15 teeth per side, lateral veins usually indistinct, 2–5 per side, apex subacute to blunt, surfaces sparsely glandular puberulent on margins and veins; bracts scarcely reduced. |
| Inflorescences | nodding in bud, later suberect, few-flowered racemes, subglabrous to sparsely strigillose and/or glandular puberulent. |
erect or sometimes nodding in bud, short racemes, glandular puberulent. |
| Flowers | suberect; buds 2–5 × 1–2 mm; pedicel 1–6(–15) mm; floral tube 0.6–1.2 × 0.8–1.8 mm, slightly raised subglabrous ring at mouth inside; sepals green to reddish purple, 1.5–5 × 0.6–1.5 mm, abaxial surface subglabrous to sparsely glandular; petals usually pink to rose-purple, rarely white, narrowly obcordate, (1.7–)2.5–6.5(–8) × 1.6–3.5 mm, apical notch 0.5–1.2 mm; filaments cream to light pink, those of longer stamens 1.4–3.2 mm, those of shorter ones 0.7–2 mm; anthers 0.3–0.6 × 0.2–0.4 mm; ovary often reddish purple, 6–20 mm, subglabrous or sparsely strigillose and glandular puberulent; style white, 1.2–2.5 mm, glabrous, stigma broadly clavate to subcapitate, entire, 0.9–1.5 × 0.4–0.7 mm, surrounded by longer anthers. |
few, erect or sometimes slightly nodding in bud; buds 3–4.5 × 2.5–3 mm; pedicel 5–10 mm; floral tube 1–2.2 × 1.2–2.2 mm, with raised ring of sparse hairs at mouth inside; sepals often red along margins, lanceolate, 3–4.8 × 1–2.1 mm, abaxial surface scattered mixed glandular puberulent and strigillose; petals dark pink to rose-purple, obcordate, (3–)5–7 × (2–)3–4.5 mm, apical notch 1–2.5 mm; filaments pale pink, those of longer stamens 2.4–4.2 mm, those of shorter ones 1.2–2.6 mm; anthers pale yellow, 0.5–1.1 × 0.3–0.7 mm; ovary 15–22(–26) mm, densely glandular puberulent; style cream, 2.5–3.5 mm, often with scattered hairs near base, stigma clavate to subcapitate, 0.8–1.5 × 0.5–1 mm, surrounded by longer anthers. |
| Capsules | slender, often reddish purple, 17–40(–55) mm, surfaces subglabrous or with scattered hairs; pedicel 5–35(–68) mm. |
24–65 mm, surfaces glandular puberulent; pedicel 10–30 mm. |
| Seeds | narrowly obovoid, 0.7–1.4 × 0.3–0.5 mm, inconspicuous chalazal collar 0.1–0.2 mm wide, light brown, surface reticulate (smooth); coma persistent, dull white, 2–4 mm. |
narrowly obovoid, (1.2–)1.4–1.7 × 0.4–0.7 mm, chalazal collar conspicuous, 0.08–0.15 ×0.15–0.25 mm, light brown, surface densely irregular papillose; coma persistent, dull white, 6–12 mm. |
| 2n | = 36. |
= 36. |
Epilobium anagallidifolium |
Epilobium smithii |
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| Phenology | Flowering Jun–Sep. | Flowering Jul–Sep. |
| Habitat | Moist flats, stream banks, subarctic coastal marsh edges, high montane and alpine meadows and seeps. | Moist talus or scree slopes, crevices of rocky outcrops, often on south-facing subalpine to alpine slopes. |
| Elevation | 0–4500 m. [0–14800 ft.] | (1000–)1500–3000 m. [(3300–)4900–9800 ft.] |
| Distribution |
AK; CA; CO; ID; ME; MT; NH; NV; OR; UT; WA; WY; AB; BC; NL; NT; NU; QC; YT; Greenland; Eurasia
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MT; UT; WA; AB; BC |
| Discussion | Epilobium anagallidifolium is widely but sparsely distributed in high montane-alpine and subarctic Eurasia, including Europe, Russia, China, and Japan. Epilobium anagallidifolium usually forms low clumps or mats, with stems nodding in bud and usually subglabrous below the inflorescence. Many collections of E. anagallidifolium from eastern Canada and Greenland tend to be unusually tall (to 25 cm) and robust for the species, with somewhat larger, thicker leaves, and longer pedicels (to 60 mm). Similarly large and robust specimens occur scattered in Yukon and Washington, and may result from occasional hybridization and introgression with sympatric species such as E. hornemannii or E. lactiflorum, which also have the CC chromosomal arrangement. In an analysis of Fennoscandian populations of the Alpinae group, I. Kytövuori (1972) found a similar pattern of mostly smaller, sigmoidal plants of E. anagallidifolium with a small proportion of larger ones, and he also suggested the possibility of hybridization and/or introgression. Plants of Epilobium anagallidifolium, and indeed of the whole Alpinae group, from Haida Gwaii (the Queen Charlotte Islands) of British Columbia (J. A. Calder and R. L. Taylor 1968), are particularly distinctive compared to those on the mainland, and difficult to interpret. The observed differences may be the result of hybridization with other sympatric species or a response to unique ecological conditions on the islands, reinforced by relative isolation from mainland British Columbia. The Linnaean name Epilobium alpinum has long been a source of nomenclatural confusion and instability, since it circumscribed at least four distinct species, especially E. anagallidifolium. A proposal by P. C. Hoch et al. (1995) to permanently reject the name E. alpinum Linnaeus was approved. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Epilobium smithii has a restricted distribution, relatively abundant on the Olympic Peninsula (Washington) and Vancouver Island (British Columbia) and more scattered across northern Washington to the Waterton-Glacier International Peace Park in Montana and adjacent Alberta. A single collection from the Uinta Mountains in Utah suggests that the range may be larger. Although Epilobium smithii has been generally ignored, it differs strikingly from most other species of Epilobium by virtue of being densely glandular puberulent all around the upper stems. It is most similar to E. clavatum, with which some authors combined it and with which it may be closely related in the CC chromosome group. Collections of Epilobium smithii are often mixed and include other species such as E. anagallifolium, E. clavatum, and E. lactiflorum, and less often E. leptocarpum and E. mirabile, the range of which all overlap with that of E. smithii. Despite the observed sympatry of these species, their similarity in floral features, and their capacity to hybridize (S. R. Seavey and P. H. Raven 1978), few obvious hybrids have been found. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
| Parent taxa | ||
| Sibling taxa | ||
| Synonyms | E. alpinum, E. pseudoscaposum | E. clavatum var. glareosum, E. glareosum |
| Name authority | Lamarck in J. Lamarck et al.: Encycl. 2: 376. (1786) | H. Léveillé: Repert. Spec. Nov. Regni Veg. 5: 8. (1908) |
| Source | FNA vol. 10. | FNA vol. 10. |
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