Epilobium hirsutum
Epilobium parviflorum
codlins-and-cream, fiddle grass, fiddle grass willowherb, great or great hairy willowherb, great willowherb, hairy willlowherb, hairy willow-herb, épilobe hirsute
hoary willowherb, small-flower hairy willow-herb, small-flower willow-herb, smaller hairy willowherb
erect to ascending, often clumped, terete, 25–120(–250) cm, unusually thick, 3–9 mm diam., well branched mainly in distal 1/2, densely long-villous throughout, usually mixed glandular puberulent distally, rarely sparsely villous or densely white-tomentose.
erect, terete, 18–100(–160) cm, well branched distally, densely gray-villous proximally, mixed villous and glandular puberulent distally, often with raised strigillose lines decurrent from margins of petioles.
opposite proximal to inflorescence, alternate distally, sessile and ± clasping stem;
blade elliptic-lanceolate to narrowly obovate or elliptic, 4–12(–23) × 0.3–4(–5) cm, base cuneate to attenuate, margins serrulate, 15–50 teeth per side, veins 6–9 per side, apex acute to acuminate or obtuse proximally, surfaces ± densely villous;
bracts moderately reduced.
opposite proximal to inflorescence, alternate distally, petioles 1–3 mm proximally, sessile distally;
blade narrowly lanceolate or oblong-lanceolate, 3–12 × 0.5–2.5 cm, often exceeding internodes, base rounded to broadly cuneate, margins serrulate, with 15–60 teeth per side, veins 4–8 per side, apex subacute, surfaces ± densely villous, hairs sometimes appressed;
bracts usually much reduced.
erect racemes or panicles, usually densely villous and glandular puberulent, rarely tomentose.
erect racemes or often leafy panicles.
erect;
buds 5–9 × 1.8–4.5 mm, sometimes beaked;
pedicel 3–11 mm;
floral tube 1.3–2.9 × 2.2–4 mm, conspicuous ring of spreading hairs near mouth inside;
sepals oblong-linear, often keeled, 6–12 × 1–3 mm, abaxial surface densely pubescent;
petals bright pink to rose-purple, rarely white, broadly obcordate, 9–20 × 7–15 mm, apical notch 1–3 mm;
filaments white or pink, those of longer stamens 5–10 mm, those of shorter ones 2.5–6 mm;
anthers cream, 1.5–3 × 0.6–1.2 mm;
ovary 15–34 mm, densely villous and glandular puberulent;
style white or pink, 5–12 mm, usually glabrous, stigma deeply 4-lobed, 1.8–2.2 × 3–5.5 mm, lobes recurved or spreading, exserted beyond anthers.
erect;
buds 3.5–5.5 × 1.8–3 mm;
pedicel 3–10 mm;
floral tube 1–1.9 × 1.3–2.5 mm, a ring of spreading hairs at mouth within, densely villous and glandular puberulent abaxially;
sepals narrowly lanceolate, often keeled, 2.5–6 × 1–1.5 mm;
petals usually pink to rose-purple, rarely white, broadly obovate, 4–8.5 × 3–4.5 mm, apical notch 1–4 mm;
filaments cream to light purple, those of longer stamens 2–6 mm, those of shorter ones 1–3.5 mm;
anthers oblong, 0.8–1.3 × 0.4–0.6 mm;
ovary 10–30 mm, mixed villous and glandular puberulent;
style white to pink, 2.2–6 mm, glabrous, stigma deeply 4-lobed, 1–1.5 × 2.2–4 mm, lobes 1–1.8 mm, initially erect, later recurved, surrounded by or barely exserted beyond anthers.
often flushed purple, 25–90 mm, surfaces usually densely villous and glandular puberulent, rarely glabrescent;
pedicel 5–20 mm.
30–70 mm, surfaces usually glandular puberulent, often mixed villous, rarely glabrescent;
pedicel 5–18 mm.
narrowly obovoid, 0.8–1.2 × 0.3–0.6 mm, chalazal collar inconspicuous, dark brown, surface coarsely papillose;
coma easily detached, tawny or dull white, 7–10 mm.
obovoid, 0.8–1.1 × 0.4–0.5 mm, chalazal collar inconspicuous, brown, surface coarsely papillose;
coma easily detached, dingy white, 5–9 mm.
= 36.
= 36.
Epilobium hirsutum
Epilobium parviflorum
Epilobium hirsutum is very widespread in cool temperate Eurasia and montane regions, occurring throughout Europe except in the far north (P. H. Raven 1968), through the Caucasus and central Asia (E. I. Steinberg 1949) to Nepal (Raven 1962), China (Chen C. J. et al. 1992), and Japan (A. W. Lievens and P. C. Hoch 1999). It occurs as well along the Mediterranean coast of Africa, through East Africa to southern Africa, and in the Canary and Cape Verde Islands (Raven 1967).
Epilobium hirsutum exceeds almost all other species of the genus in stature, so its size, very large flowers, and densely villous aspect make it easy to identify. R. L. Stuckey (1970) provided a detailed account of the introduction and spread of E. hirsutum in North America, noting the earliest known collection (July 1829) was from Newport, Rhode Island. Most early collections appeared in waste areas, particularly near harbor ballast piles, although some may have been grown in gardens. By the 1890s this species was well established along the Atlantic coastal region from New Jersey and Philadelphia through New England, and around Niagara Falls in the Great Lakes region. During the twentieth century, E. hirsutum spread extensively in southern Ontario and Quebec, south along the Atlantic coast to Maryland, and to all of the states along the southern shores of the Great Lakes, most recently including Wisconsin (1970), and Indiana (1972). It occurs in much the same habitat as that of another, more widely publicized invader, Lythrum salicaria, and sometimes is recorded as a companion species. The earliest known collection in western North America was made in 1933 in Bingen (Klickitat County), Washington. Whether from that introduction or others, E. hirsutum is now naturalized and widespread in the Pacific Northwest. It also was reported recently from the Denver region in Colorado and near Midway in Utah.
Epilobium grandiflorum F. H. Wiggers and E. grandiflorum Allioni are illegitimate names that pertain here.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Epilobium parviflorum is widespread in Eurasia, from Europe through the Caucasus and southern Asia to eastern China (Chen C. J. et al. 1992), and in northwestern Africa and the Canary Islands (P. H. Raven 1967). Prior to the report of naturalized populations of E. parviflorum in Ontario by N. J. Purcell (1976), the species was considered an ephemeral adventive in New Jersey, New York, and Pennsylvania, where collections were made on ballast heaps in 1877–1880 (W. Trelease 1891; H. A. Gleason 1952, vol. 2) but not subsequently. However, recent collections indicate well-established populations scattered widely across the Great Lakes region (Purcell; E. G. Voss 1972–1996, vol. 2; T. S. Cooperrider and B. K. Andreas 1991) and more recently in the Pacific Northwest. Epilobium parviflorum is clearly naturalized and can be expected to spread farther, given its weedy nature (Raven and T. E. Raven 1976).
Epilobium parviflorum most closely resembles E. hirsutum, sharing the otherwise unique combination of densely villous pubescence and 4-lobed stigmas, but differs by having smaller flowers, leaves not clasping and/or decurrent on stems, and perennating by rosettes rather than by thick ropy stolons. The two species co-occur throughout most of their range in Eurasia, and although their adventive ranges in North America are quite similar, E. hirsutum has spread much more widely and rapidly.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
BC
OR
WA
Flora NW
Go Botany
IL Wildflowers
MD Biodiversity
MI Flora
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
