Flora of North America species comparison

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Epilobium siskiyouense

Epilobium howellii
Epilobium siskiyouense

Siskiyou fireweed, Siskiyou rock-fringe, Siskiyou willow-herb

subalpine fireweed, yuba pass willowherb
Habit Herbs ± suffruticose, shoots from woody caudex with barklike periderm extending to 40 cm below ground, shoots with scaly bases. Herbs with short, threadlike stolons with scattered, minute leaves.
Stems

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.

delicate, erect, loosely clumped, terete, 5–20 cm, simple or branched from base, densely glandular puberulent, without decurrent lines.
Leaves

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, alternate distally, subsessile;

blade broadly obovate to orbiculate proximally to ovate or lanceolate distally, 0.4–2 × 0.3–1.2 cm, base cuneate to rounded, margins finely denticulate, 4–6 low teeth per side, veins indistinct, 2–6 per side, apex obtuse to subacute distally, surfaces subglabrous with strigillose margins and veins or both surfaces sparsely strigillose distally;

bracts much reduced and narrower.
Inflorescences

erect, compact racemes, densely canescent and glandular puberulent, or subglabrous, only ovaries pubescent.

erect, open racemes, glandular puberulent.
Flowers

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.

sometimes cleistogamous;

buds 2–3.5x 1–1.5 mm, often nodding;

pedicel 8–16 mm;

floral tube 0.4–0.8 × 0.5–1 mm, ring of sparse hairs at mouth inside, or absent;

sepals 1.5–2 × 0.8–1 mm;

petals white, 2–3 × 1.5–2 mm, apical notch 0.4–0.5 mm;

filaments white, those of longer stamens 1.8–3 mm, those of shorter ones 1–1.5 mm;

anthers 0.3–0.4 ×0.3–0.4 mm;

ovary 9–12 mm, sparsely glandular puberulent;

style white, 2–3 mm, stigma white, narrowly clavate, entire, 0.5–0.6 × 0.4–0.5 mm, surrounded by anthers.
Capsules

25–45 mm, surfaces canescent and glandular puberulent;

pedicel 6–25 mm.

35–45 mm, surfaces subglabrous to sparsely glandular puberulent;

pedicel 25–40 mm.
Seeds

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 oblanceoloid, 0.8–1.1 × 0.3–0.4 mm, chalazal collar inconspicuous, surface low papillose;

coma easily detached, dingy white, 3–6 mm.
2n

= 36.

= 36.

Epilobium siskiyouense

Epilobium howellii
Phenology Flowering Jul–Aug. Flowering Jul–Aug.
Habitat Stream banks, moist, rocky slopes, montane ridges, sometimes on serpentine areas. Mossy seeps, semi-shaded swales, grassy montane meadows.
Elevation 1600–2500 m. [5200–8200 ft.] 2000–2700 m. [6600–8900 ft.]
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[BONAP county map]
Discussion

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 howellii is an enigmatic species in that it was apparently overlooked until relatively recently by numerous botanists in the Sierra Nevada in Fresno, Mono, and Sierra counties. Its similarity to many of the smaller species of Epilobium, especially in the Alpinae group, may have caused this oversight; it is very clearly distinguished from similar species by its exclusively glandular puberulent stems. Recent focused collecting efforts mainly by United States Forest Service personnel have shown that it is much more widespread than originally thought, although still uncommon, and its geographical and ecological range is still quite restricted compared to most other species of Epilobium.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
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
E. anagallidifolium, E. arcticum, E. brachycarpum, E. campestre, E. canum, E. ciliatum, E. clavatum, E. cleistogamum, E. coloratum, E. davuricum, E. densiflorum, E. densum, E. foliosum, E. glaberrimum, E. hallianum, E. hirsutum, E. hornemannii, E. howellii, E. lactiflorum, E. leptocarpum, E. leptophyllum, E. luteum, E. minutum, E. mirabile, E. montanum, E. nevadense, E. nivium, E. obcordatum, E. obscurum, E. oreganum, E. oregonense, E. pallidum, E. palustre, E. parviflorum, E. rigidum, E. saximontanum, E. septentrionale, E. smithii, E. suffruticosum, E. torreyi
E. anagallidifolium, E. arcticum, E. brachycarpum, E. campestre, E. canum, E. ciliatum, E. clavatum, E. cleistogamum, E. coloratum, E. davuricum, E. densiflorum, E. densum, E. foliosum, E. glaberrimum, E. hallianum, E. hirsutum, E. hornemannii, E. lactiflorum, E. leptocarpum, E. leptophyllum, E. luteum, E. minutum, E. mirabile, E. montanum, E. nevadense, E. nivium, E. obcordatum, E. obscurum, E. oreganum, E. oregonense, E. pallidum, E. palustre, E. parviflorum, E. rigidum, E. saximontanum, E. septentrionale, E. siskiyouense, E. smithii, E. suffruticosum, E. torreyi
Synonyms E. obcordatum subsp. siskiyouense, E. obcordatum var. laxum
Name authority (Munz) Hoch & P. H. Raven: Madroño 27: 146. (1980) Hoch: Phytologia 73: 460. (1993)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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