Epilobium siskiyouense
Epilobium hornemannii
Siskiyou fireweed, Siskiyou rock-fringe, Siskiyou willow-herb
Hornemann's willow-herb, épilobe de Hornemann
several to many, erect to ascending, loosely clumped, terete, 10–25 cm, rarely branched distal to base, usually short-villous and strigillose throughout, mixed sparsely glandular puberulent distally, rarely subglabrous proximal to inflorescence.
ascending to erect, clumped, terete, 10–45 cm, usually simple, rarely branched proximally, subglabrous proximal to inflorescence with sparsely strigillose lines decurrent from margins of petioles, ± sparsely mixed strigillose and glandular puberulent distally.
opposite proximal to inflorescence, alternate and usually crowded distally, sessile;
blade gray-green, narrowly to broadly ovate, 1.3–2.6 × 0.8–2 cm, base rounded to subcordate, margins usually serrulate, 6–12 teeth per side, rarely subentire, veins inconspicuous, 3–5 per side, apex rounded proximally to acute distally, surfaces sparsely short-villous to subglabrous and glaucous;
bracts much reduced.
opposite proximal to inflorescence, usually alternate distally, petioles 3–9 mm proximally to subsessile distally;
blade broadly elliptic to spatulate proximally, ovate to lanceolate distally, ± coriaceous or not, 1.5–6.2 × 0.7–2.9 cm, base attenuate to cuneate or rounded, margins subentire proximally, denticulate distally with 10–25 teeth per side, veins often inconspicuous, 4–7 per side, apex obtuse to subacute, surfaces glabrous or, sometimes, strigillose along margins;
bracts reduced.
erect, compact racemes, densely canescent and glandular puberulent, or subglabrous, only ovaries pubescent.
erect or nodding, open racemes, mixed strigillose and glandular puberulent.
erect;
buds often purplish green, 9–11 × 3.5–5 mm, blunt;
pedicel 6–12 mm;
floral tube 2.1–4 × 2.9–5 mm, prominent ring of tissue 0.3–0.6 mm wide, edged by spreading hairs, 0.9–1.8 mm from base of tube inside;
sepals purplish green, 5–10.5 × 2–3.5 mm, apex acute;
petals pink to rose-purple, obcordate, 10–22.5 × 9.5–15.5 mm, apical notch 2–6.5 mm;
filaments cream, those of longer stamens 6.5–14 mm, those of shorter ones 3.5–11 mm;
anthers cream 1.9–3.3 × 0.7–1.2 mm;
ovary 12–22 mm, ± densely canescent and glandular puberulent;
style white to light pink, 10.5–18 mm, sparsely villous just proximal to stigma, stigma broadly 4-lobed, 1–1.8 × 2.4–4.2 mm, exserted beyond anthers.
erect;
buds 2–5.5 × 2–4 mm;
pedicel 2–5 mm;
floral tube 1–2.2 × 1.3–2.8 mm, sparse ring of hairs at mouth inside or ring absent;
sepals sometimes red-tipped or bright red, 2–7 × 1–2.2 mm, abaxial surface sparsely strigillose and glandular puberulent;
petals usually rose-purple or magenta to light pink, rarely white, 3–10(–11) × 2–6 mm, apical notch 0.7–2.4 mm;
filaments cream to light pink, those of longer stamens 1.4–5(–6) mm, those of shorter ones 1.2–4 mm;
anthers light yellow, 0.4–1.2 × 0.3–0.6 mm;
ovary 15–25 mm, glandular puberulent, sometimes mixed strigillose;
style white or cream, 2–8 mm, stigma cream, clavate or cylindrical, entire, 1.2–3 × 0.5–1 mm, usually surrounded by, rarely exserted beyond, anthers.
25–45 mm, surfaces canescent and glandular puberulent;
pedicel 6–25 mm.
35–65 mm, surfaces glandular puberulent, sometimes mixed strigillose;
pedicel 5–15(–25) mm.
narrowly obovoid, 1.4–1.9 × 0.6–0.7 mm, with low, obscure chalazal collar, light brown, surface papillose;
coma easily detached, somewhat tawny, 4–8 mm.
narrowly fusiform or oblanceoloid, 0.9–1.6 × 0.3–0.5 mm, chalazal collar short, 0.05–0.1 mm, blond to brown, surface distinctly papillose or reticulate/smooth;
coma readily detached, dingy white, 6–11 mm.
= 36.
Epilobium siskiyouense
Epilobium hornemannii
Epilobium siskiyouense is endemic to the Klamath region in southwestern Oregon (Jackson County) and north-central California in the Salmon, Scott Bar, and Siskiyou mountains of Siskiyou and Trinity counties. As noted by Hoch and Raven, this geographical range and several morphological features appear to be intermediate between those of E. obcordatum and E. rigidum. All three species have unusually large flowers (12–26 mm) with four-lobed stigmas, and as a group are quite distinct from their congeners in the region. Despite these similarities, the three taxa differ substantially in details of floral structure, especially regarding the dimensions of the floral tube. Specifically, E. rigidum has mean petal length 18.2 mm, floral tubes 1–1.6 × 2.5–3.6 mm; E. siskiyouense mean petal length 17.1 mm, floral tubes 2.1–4 × 2.9–5 mm; and E. obcordatum mean petal length 18.6 mm, floral tubes 3.2–5.2 × 2.2–3.6 mm. Thus, in flowers that are similar in overall size and aspect, E. rigidum has a very short, broad floral tube, E. obcordatum has a relatively long, narrow tube, and E. siskiyouense has a tube intermediate in size and shape. In terms of the ratio of tube length to width, the three taxa do not overlap. Although these characters are difficult to include in a key (since they require floral dissection and/or precise measurements), they are diagnostic for these species.
Epilobium siskiyouense has an additional diagnostic floral character that is unique in the genus. Whereas most other species of Epilobium have a simple ring of spreading hairs, sometimes with a low ridge of tissue near the mouth of the floral tube, E. siskiyouense has a relatively broad ring of tissue (0.3–0.6 mm wide), shaped like a washer, from which spreading hairs arise; this feature may provide protection for the nectar.
Epilobium siskiyouense has two distinct patterns of vestiture on the stems. In some specimens, the lower stems are mixed canescent and glandular puberulent and the inflorescence only glandular puberulent. In other specimens, the stems are subglabrous below a sparsely canescent and glandular puberulent inflorescence. There is no obvious correlation of this difference with any other morphological, ecological, or geographical factors.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Subspecies 2 (2 in the flora).
Epilobium hornemannii occurs widely in montane and boreal regions in North America and western Eurasia, and also in Japan and the Russian Far East. It is characterized by having the CC chromosome arrangement and is included in the Alpinae alliance with E. anagallidifolium, E. lactiflorum, and others (I. Kytövuori 1972).
W. Trelease (1891) discussed eastern and western forms of Epilobium hornemannii, the latter divided into two variations; however, he did not formally recognize any of these variants.
P. A. Munz (1965) included the Eurasian Epilobium alsinifolium Villars in his North American treatment, noting that it occurred in Greenland. However, B. Fredskild (1984) suggested that, for the most part, these determinations represent misidentifications of E. hornemannii.
The two subspecies recognized here intergrade throughout much of their shared range, but whereas subsp. hornemannii is commonly found in high montane to alpine regions, in the northern part of its range it grows at much lower elevations, and in maritime areasis replaced by coriaceous-leaved forms here designated as subsp. behringianum. The situation is rather analogous to the pattern seen in E. ciliatum in which subsp. ciliatum is wide-ranging and variable, but replaced in Pacific maritime areas by subsp. watsonii, from which it differs consistently in most specimens, but sometimes intergrades.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Leaves not coriaceous, petioles 3–7 mm proximally; sepals 2–4.5 mm; petals 3–9 mm; capsules 40–65 mm; seeds 0.9–1.2 mm, surface papillose. | subsp. hornemannii |
1. Leaves ± coriaceous, petioles 4–9 mm proximally; sepals 5–7 mm; petals 8–10(–11) mm; capsules 35–55 mm; seeds 0.9–1.6 mm, surface reticulate. | subsp. behringianum |
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