Flora of North America species comparison

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Epilobium leptophyllum

Epilobium oregonense

bog willow-herb, linearleaf willowweed, narrow-leaf willowherb, slender leaf willowherb, épilobe leptophylle

Oregon willowherb, slim-stem willowweed
Habit Herbs with threadlike, nearly leafless epigeous stolons terminating in compact, fleshy turions 3–8 × 2–4 mm. Herbs with slender stolons to 18 cm with minute, rounded leaves.
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.

erect or ascending, often loosely matted, often flushed purple distally, terete, 8–30(–40) cm, simple or sparsely branched from base, subglabrous.
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 proximal to inflorescence, alternate distally, subsessile;

blade broadly elliptic proximally, narrowly elliptic or lanceolate to sublinear distally, 5–25 × 1–7 mm, longer than internodes proximally to much shorter distally, base cuneate to rounded, margins subentire, veins extremely faint, 3–5 per side, apex obtuse, surfaces subglabrous;

bracts extremely reduced and linear.
Inflorescences

erect racemes, densely strigillose, often mixed sparsely glandular puberulent.

usually erect, sometimes nodding in bud, racemes, open, unbranched, sparsely strigillose and glandular puberulent.
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.

suberect or nodding;

buds 2–3.5 × 1–1.5 mm, apex blunt;

pedicel 2–7 mm;

floral tube 0.8–1.8 × 1–2.1 mm, with faint ring of hairs at mouth inside;

sepals often flushed purple, 2.5–4.5 × 1–1.6 mm;

petals white to pink, 5–8 × 2.8–4 mm, apical notch 0.8–1.5 mm;

filaments white, those of longer stamens 2.8–4.5 mm, those of shorter ones 2–3.8 mm;

anthers yellow-cream, 0.8–1.2 × 0.4–0.5 mm;

ovary green to purple, 8–14 mm, sparsely strigillose and glandular puberulent;

style white, 3.8–4.8 mm, glabrous, stigma subcapitate, 1–1.4 × 1–1.2 mm, surrounded by longer anthers.
Capsules

straight, narrowly cylindrical, 35–80 mm, surfaces densely strigillose;

pedicel 10–35 mm.

slender, often purplish green, 21–40(–52) mm, surfaces subglabrous;

pedicel 20–65 mm.
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.

narrowlyoblanceoloid or subfusiform, 1–1.4 × 0.4–0.6 mm, chalazal collar 0.1–0.2 mm, light brown, surface low papillose;

coma persistent, whitish, 3–4 mm.
2n

= 36.

= 36.

Epilobium leptophyllum

Epilobium oregonense
Phenology Flowering Jun–Sep. Flowering Jul–Aug.
Habitat Marshy ground, bogs, fens, low thickets, seepage areas, damp pastures. Montane to subalpine boggy or mossy areas, wet meadows, protected, semi-shaded stream banks.
Elevation 0–1000(–2900) m. (0–3300(–9500) ft.) 1200–3000(–3500) m. (3900–9800(–11500) ft.)
Distribution
from FNA
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
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; BC
[WildflowerSearch map]
[BONAP county map]
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.)

Epilobium oregonense is a distinctive western North American endemic, found primarily throughout the Cascade–Sierra mountain complex barely into the Transverse Ranges of southern California, and very scattered through the Rocky Mountains. It is exceedingly rare in Arizona, Colorado, and New Mexico.

Even though Epilobium oregonense bears some similarity to E. anagallidifolium and other members of the Alpinae group, and often grows in close proximity to them, this species does not share the derived CC chromosomal arrangement with that group, instead having the more globally widespread BB arrangement. The similarities with E. anagallidifolium include the small stature, small, obtuse, and subentire leaves, and long pedicels in fruit; however, E. oregonense differs by its long, threadlike stolons, distal leaves extremely narrow and reduced in size relative to the internodes, and near complete absence of pubescence on the plant, including a lack of raised lines of hairs on the stems.

Another species with which Epilobium oregonense has been confused is E. hallianum, but that species always forms condensed basal turions, is more strictly erect, and generally has larger and more denticulate leaves. The distinctive and diagnostic stolons of E. oregonense are similar to those found in E. palustre and related species (all of which also have the BB chromosome arrangement), except that those of E. oregonense never terminate in a condensed turion, as found in those other species. The exact affinities of E. oregonense remain uncertain, but it appears to be most closely related to the E. palustre complex.

Some specimens of Epilobium oregonense grow as floating mats in cold streams; these specimens are notably large, with particularly strong development of basal stolons and larger, more lanceolate leaves. As evidenced by mixed herbarium collections, E. oregonense grows sympatrically with several congeners, including E. anagallidifolium, E. ciliatum subspp. ciliatum and glandulosum, E. hallianum, and E. hornemannii, and hybridizes occasionally, at least with E. ciliatum subsp. ciliatum and E. hornemannii.

Epilobium oregonense var. gracillimum Trelease, which pertains here, was not validly published, and other names based on it are also invalid.

(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. 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
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. pallidum, E. palustre, E. parviflorum, E. rigidum, E. saximontanum, E. septentrionale, E. siskiyouense, E. smithii, E. suffruticosum, E. torreyi
Synonyms E. densum var. nesophilum, E. nesophilum, E. oliganthum var. gracile, E. palustre var. gracile, E. squamatum, E. tenellum
Name authority Rafinesque: Précis Découv. Somiol., 41. (1814) Haussknecht: Monogr. Epilobium, 276, plate 14, fig. 66. (1884)
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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