Epilobium siskiyouense
Epilobium densum
Siskiyou fireweed, Siskiyou rock-fringe, Siskiyou willow-herb
downy willowherb, épilobe dressé
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.
erect, simple or loosely clustered, terete, 15–95 cm, often well branched distally, densely villous throughout, sometimes mixed glandular puberulent distally, decurrent lines absent.
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 proximally, alternate and often fasciculate distally, subsessile;
blade oblong-lanceolate to sublinear, 2–4.5 × 0.3–0.9 cm, ± exceeding internodes, base cuneate, margins entire or denticulate, 3–6 inconspicuous teeth per side, sometimes revolute, veins apparent on abaxial side, 3–5 per side, apex acute, surfaces villous, especially distally;
bracts somewhat reduced.
erect, compact racemes, densely canescent and glandular puberulent, or subglabrous, only ovaries pubescent.
erect racemes, branched or not, densely villous, sometimes mixed 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 × 1.5–1.5 mm;
pedicel 3–8 mm;
floral tube 1–1.8 ×1–2 mm, ring of spreading hairs at mouth inside;
sepals 2–4.5 × 1–1.3 mm, abaxial surface villous and glandular puberulent;
petals light to dark pink, obcordate, 4–6 × 2–3 mm, apical notch 1–1.5 mm;
filaments pink, those of longer stamens 2–3.5 mm, those of shorter ones 1–2 mm;
anthers cream, 0.5–0.8 × 0.4–0.6 mm;
ovary 12–20 mm, densely villous, often mixed glandular puberulent;
style cream, 2–3.5 mm, stigma narrowly clavate, entire, 1–1.6 × 0.5–1 mm, surrounded by anthers.
25–45 mm, surfaces canescent and glandular puberulent;
pedicel 6–25 mm.
35–68 mm, short-beaked, surfaces densely villous, sometimes mixed glandular puberulent;
pedicel 5–15 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 to narrowly obovoid, 1.5–2 × 0.5–0.6 mm, chalazal collar inconspicuous, 0.1 mm, surface low papillose;
coma persistent, dingy white, 6–8 mm.
= 36.
= 36.
Epilobium siskiyouense
Epilobium densum
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.)
Epilobium densum is relatively uncommon but widely distributed within the Great Lakes-St. Lawrence River region in boggy or marshy areas. Within that region, it sometimes grows in close proximity with E. leptophyllum and E. palustre; it is densely pubescent like E. leptophyllum, and although the type of hairs differs markedly on the two species, they sometimes are found mixed on herbarium sheets. Because it is less pubescent, E. palustre is rarely mixed or confused with E. densum. Hybrids among these species occur but are uncommon and generally marked by slightly to moderately reduced seed fertility.
M. L. Fernald (1944d), among others, argued that names published in the Catalogus by Muhlenberg were not validly published. In the case of Epilobium strictum, K. Sprengel considered that Muhlenberg provided enough of a description (upright, soft) to validate the name in 1825. However, Rafinesque had validly published the name E. densum for the same taxon in 1814.
Epilobium molle Torrey is an illegitimate name that pertains here.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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