Epilobium leptophyllum |
Epilobium glaberrimum |
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bog willow-herb, linearleaf willowweed, narrow-leaf willowherb, slender leaf willowherb, épilobe leptophylle |
glaucous willowherb, glaucus willowherb, smooth willowherb |
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Habit | Herbs with threadlike, nearly leafless epigeous stolons terminating in compact, fleshy turions 3–8 × 2–4 mm. | Herbs with branching, wiry basal shoots with crowded, often dark, scales. | ||||
Stems | erect, simple to loosely clustered, terete, 15–95 cm, simple to well branched, densely strigillose, often mixed glandular puberulent on inflorescence, rarely with faint strigillose lines decurrent from margins of petioles. |
many, erect or ascending, often densely clumped, slender, terete, 5–75(–85) cm, simple or distally branched, glabrous and glaucous, sometimes strigillose and/or mixed glandular puberulent distally, rarely with faint raised strigillose lines decurrent from margins of distal petioles. |
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Leaves | opposite proximally, usually alternate, rarely fasciculate distally, subsessile; blade linear to very narrowly elliptic or sublanceolate, 2–7.5 × 0.1–0.7 cm, usually longer than internodes, base rounded to subcuneate, margins subentire, 4–7 inconspicuous teeth per side, sometimes revolute, lateral veins inconspicuous, apex obtuse proximally to acute distally, both surfaces densely strigillose, increasing distally; bracts not much reduced. |
opposite and crowded proximal to inflorescence, alternate and widely spaced distally, subsessile and ± clasping; blade light green or blue-green, very narrowly lanceolate to narrowly ovate or elliptic, (0.5–)1–7.2 × (0.3–)0.5–1.8 cm, base cuneate, margins subentire or faintly denticulate, 8–15 teeth per side, veins inconspicuous, 3–6 per side, apex obtuse proximally to acute distally, glabrous and glaucous; bracts much reduced and narrower. |
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Inflorescences | erect racemes, densely strigillose, often mixed sparsely glandular puberulent. |
erect racemes, glabrous or ± sparsely glandular puberulent, sometimes mixed strigillose. |
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Flowers | erect; buds 3–5 × 1.5–2.5 mm; pedicel 5–12 mm; floral tube 0.8–1.5 × 1.2–1.8 mm, ring of spreading hairs at mouth inside; sepals 2.5–4.5 × 0.9–1.3 mm, abaxial surface strigillose; petals obcordate, white to light pink, 3.5–7 × 1.6–4 mm, apical notch 1–1.8 mm; filaments white or cream, those of longer stamens 0.8–3.5 mm, those of shorter ones 0.6–2.5 mm; anthers cream, 0.5–0.9 × 0.4–0.6 mm; ovary 12–18 mm, densely strigillose, sometimes mixed glandular puberulent; style cream, 2–3.8 mm, stigma narrowly clavate, entire, 1–1.8 × 0.5–1.2 mm, usually surrounded by, rarely exserted beyond, anthers. |
erect; buds 2.5–5 × 2–3.5 mm; pedicel 2–11(–20) mm; floral tube 0.7–2.3 × 1–2.5 mm, ring of spreading hairs at mouth inside or without a ring; sepals often red-tipped, sometimes keeled, 2.5–7.5 × 0.8–2 mm, abaxial surface glabrous or strigillose and/or glandular puberulent; petals usually light pink to rose-purple, rarely white, 3.4–10(–12) × 1.8–5 mm, apical notch 0.5–3 mm; filaments purple to white or cream, those of longer stamens 2.4–5(–6) mm, those of shorter ones 1.4–4 mm; anthers light yellow, 0.5–1.2(–1.5) × 0.3–0.7 mm; ovary 10–42 mm, subglabrous to sparsely mixed strigillose and glandular puberulent; style light yellow or cream, 1.7–5(–7) mm, stigma clavate to subcapitate, 0.8–3 × 0.5–1.2 mm, usually surrounded by, rarely exserted beyond, longer anthers. |
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Capsules | straight, narrowly cylindrical, 35–80 mm, surfaces densely strigillose; pedicel 10–35 mm. |
15–75 mm, with small protuberance at base, surfaces subglabrous to sparsely mixed strigillose and glandular puberulent; pedicel 5–18(–25) mm. |
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Seeds | narrowly fusiform to narrowly obovoid, 1.5–2.2 ×0.5–0.7 mm, chalazal collar 0.1–0.2 mm, ± pronounced, surface papillose; coma persistent, dingy white, 6–8 mm. |
narrowly obovoid, 0.7–1(–1.3) × 0.3–0.5 mm, chalazal collar inconspicuous, light brown or gray, surface coarsely papillose in longitudinal rows; coma readily detached, white, 4–9 mm. |
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2n | = 36. |
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Epilobium leptophyllum |
Epilobium glaberrimum |
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Phenology | Flowering Jun–Sep. | |||||
Habitat | Marshy ground, bogs, fens, low thickets, seepage areas, damp pastures. | |||||
Elevation | 0–1000(–2900) m. (0–3300(–9500) ft.) | |||||
Distribution |
AK; CA; CO; CT; IA; ID; IL; IN; KS; KY; MA; MD; ME; MI; MN; MO; MT; NC; ND; NE; NH; NJ; NM; NV; NY; OH; OK; OR; PA; RI; SD; TN; TX; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NF; NS; NT; ON; PE; QC; SK; SPM
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w North America; nw Mexico
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Discussion | The range of Epilobium leptophyllum overlaps with that of the related E. palustre, but the former is less common to the north and more common south into the midwestern United States, and absent only from most of the southern tier of states. It is also relatively uncommon in the western United States and Canada. Judging by the number of herbarium sheets that also include E. palustre, E. densum, and even E. coloratum, it sometimes occurs in sympatry with those species and may rarely hybridize with them, based on plants with intermediate morphology and/or sterile fruits. Fernald described Epilobium nesophilum from the Magdalen Islands (Quebec), and especially Newfoundland, first as a variety of E. densum (1918), then as a separate species (1925). Epilobium rosmarinifolium Pursh 1813, an illegitimate name (not Haenke 1788), pertains here. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Subspecies 2 (2 in the flora). Epilobium glaberrimum is restricted mainly to the Sierra Nevada-Cascade region, but also (subsp. fastigiatum) in the northern Rocky Mountains. It is one of the more easily identified species due to its consistently glabrous and glaucous aspect. Although the distributions and elevational ranges of the two subspecies appear to overlap extensively, they are largely allopatric with subsp. glaberrimum occurring in lower to mid montane zones and subsp. fastigiatum in upper montane to subalpine zones in the southern part of its range, and in lower zones farther north. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 10. | FNA vol. 10. | ||||
Parent taxa | Onagraceae > subfam. Onagroideae > tribe Epilobieae > Epilobium > sect. Epilobium | Onagraceae > subfam. Onagroideae > tribe Epilobieae > Epilobium > sect. Epilobium | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | E. densum var. nesophilum, E. nesophilum, E. oliganthum var. gracile, E. palustre var. gracile, E. squamatum, E. tenellum | E. fastigiatum var. glaberrimum | ||||
Name authority | Rafinesque: Précis Découv. Somiol., 41. (1814) | Barbey in W. H. Brewer et al.: Bot. California 1: 220. (1876) | ||||
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