Hemp-agrimony is a perennial herb (3) that flowers in late summer and early autumn (6). The flowers are pollinated mainly by butterflies and moths, and to a lesser extent by bees and flies. Cross-pollination with flowers in the same flower head can also occur, however (2).  In The compleat herbal of 1694, hemp-agrimony was listed as a cure for, amongst other things, catarrh and coughs, obstructions of the urine and jaundice (6).

Hemp-agrimony is a tall and bushy plant which is in no way related to the plants hemp or agrimony (4). It has a woody rootstock and downy shoots that may have short branches with toothed segments, but the leaves on stem braches are lance or egg-shaped (2). The flat flower heads are pinkish-purple or, more rarely, whitish (5) and have earned the plant the local name of 'raspberries and cream' in some areas (6).

Eupatorium trifoliatum L.:
United States (North America)

Eupatorium cannabinum L.:
China (Asia)
Russian Federation (Asia)
United States (North America)

Canada

Origin: Exotic

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

United States

Origin: Exotic

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

This native plant is widespread and common throughout much of Britain (2), but becomes scarcer towards the north and is mainly a coastal species in Scotland (3) (5). It is absent from the Outer Hebrides, Orkney and Shetland (2). Hemp-agrimony is also found in the Channel Islands, most of Europe, western and central Asia and North Africa (2).

Eupatorium cannabinum is a garden escape; it is native to Europe and may be established in British Columbia; it is only casually adventive elsewhere in the flora area.

Perennials, 30–150 cm. Stems (from short rhizomes) single, branched distally, puberulent. Leaves opposite; subsessile or petiolate; blades palmately 3(–5)-lobed (at least larger proximal, lobes relatively broad), blades (or lobes) lanceolate to lance-ovate, 50–100 × 20–40 mm, margins serrate, apices rounded to acute, faces puberulent, gland-dotted. Heads in dense, corymbiform arrays. Phyllaries 8–10 in 2–3 series, oblong, 4.5–6 × 1.5–2 mm, apices rounded, abaxial faces puberulent, gland-dotted. Florets (4–)5(–6); corollas (usually pinkish) 2–2.5 mm. Cypselae 2–3 mm; pappi of 20–30 bristles 3–5 mm. 2n = 20.

Found in a broad range of wet and damp habitats, such as marshes, wet heath, wet woodland, fen-meadows, dune slacks and beside water. It is not as common in dry habitats, but it may occur in dry woodlands, waste ground and on hedge banks (3).

Foodplant / gall
larva of Adaina microdactyla causes gall of stem of Eupatorium cannabinum

Foodplant / saprobe
apothecium of Allophylaria subliciformis is saprobic on dead stem of Eupatorium cannabinum

Foodplant / saprobe
immersed, clypeate perithecium of Anthostomella tomicoides is saprobic on dead stem of Eupatorium cannabinum
Other: minor host/prey

Plant / resting place / on
puparium of Calycomyza artemisiae may be found on leaf of Eupatorium cannabinum

In Great Britain and/or Ireland:
Foodplant / saprobe
effuse colony of Chalara dematiaceous anamorph of Chalara urceolata is saprobic on dead stem of Eupatorium cannabinum

Foodplant / saprobe
effuse colony of Chromelosporium anamorph of Chromelosporium ochraceum is saprobic on dead stem of Eupatorium cannabinum

Foodplant / saprobe
apothecium of Crocicreas cyathoideum var. cyathoideum is saprobic on dead stem of Eupatorium cannabinum
Remarks: season: 3-10

Foodplant / saprobe
effuse colony of Cylindrotrichum dematiaceous anamorph of Cylindrotrichum oligospermum is saprobic on dead stem of Eupatorium cannabinum
Remarks: season: 4-9

Plant / resting place / on
Dendrothrips saltator may be found on live Eupatorium cannabinum

Foodplant / saprobe
effuse colony of Fusariella dematiaceous anamorph of Fusariella sarniensis is saprobic on dead stem of Eupatorium cannabinum

Foodplant / parasite
Golovinomyces cichoracearum parasitises live Eupatorium cannabinum

Foodplant / saprobe
apothecium of Hyalopeziza millepunctata is saprobic on dead, standing stem (near base) of Eupatorium cannabinum
Remarks: season: 10-6

Foodplant / saprobe
apothecium of Hymenoscyphus repandus is saprobic on dead stem of Eupatorium cannabinum
Remarks: season: 5-10

Foodplant / saprobe
fruitbody of Lachnella villosa is saprobic on dead, decayed stem of Eupatorium cannabinum

Foodplant / saprobe
sessile apothecium of Lasiobelonium nidulum is saprobic on dead stem of Eupatorium cannabinum
Remarks: season: 5-6
Other: major host/prey

Foodplant / saprobe
immersed pseudothecium of Leptosphaeria agnita is saprobic on dead stem of Eupatorium cannabinum
Remarks: season: 5-7

Foodplant / saprobe
immersed pseudothecium of Leptosphaeria haematites is saprobic on dead, red stained stem of Eupatorium cannabinum

Foodplant / saprobe
immersed, sometimes becoming free pseudothecium of Leptospora rubella is saprobic on dead stem of Eupatorium cannabinum
Remarks: season: 4-8

Foodplant / saprobe
clustered or linear conidioma of Leptostroma coelomycetous anamorph of Leptostroma eupatorii is saprobic on dead stem of Eupatorium cannabinum
Remarks: season: 4-5

Plant / resting place / within
puparium of Liriomyza eupatoriana may be found in leaf-mine of Eupatorium cannabinum
Other: sole host/prey

Foodplant / miner
larva of Liriomyza eupatorii mines leaf of Eupatorium cannabinum
Other: major host/prey

Foodplant / miner
larva of Liriomyza strigata mines leaf of Eupatorium cannabinum

Foodplant / open feeder
adult of Longitarsus aeruginosus grazes on leaf of Eupatorium cannabinum

Foodplant / open feeder
adult of Longitarsus succineus grazes on leaf of Eupatorium cannabinum

Plant / resting place / within
puparium of Melanagromyza eupatorii may be found in stem of Eupatorium cannabinum

Foodplant / saprobe
immersed or erumpent perithecium of Melomastia mastoidea is saprobic on dead stem of Eupatorium cannabinum

Foodplant / saprobe
sessile apothecium of Mollisia coerulans is saprobic on dead stem of Eupatorium cannabinum
Remarks: season: 4-6
Other: major host/prey

Plant / associate
mycelial muff of Morchella esculenta is associated with live root of Eupatorium cannabinum
Other: unusual host/prey

Foodplant / saprobe
sessile sporodochium of Myrothecium dematiaceous anamorph of Myrothecium carmichaelii is saprobic on dead stem of Eupatorium cannabinum

Foodplant / saprobe
superficial, scattered on in small groups, thinly subiculate perithecium of Nectria ellisii is saprobic on dead stem of Eupatorium cannabinum
Remarks: season: 5-12

Foodplant / saprobe
superficial perithecium of Nectria pseudopeziza is saprobic on dead stem of Eupatorium cannabinum
Remarks: season: 9-4

Foodplant / saprobe
pycnidium of Phomopsis coelomycetous anamorph of Phomopsis eupatoriicola is saprobic on dead, old stem of Eupatorium cannabinum
Remarks: season: 6

Foodplant / spot causer
scattered, epiphyllous pycnidium of Phyllosticta coelomycetous anamorph of Phyllosticta eupatorii causes spots on fading leaf of Eupatorium cannabinum
Remarks: season: 8

Foodplant / miner
larva of Phytomyza eupatorii mines leaf of Eupatorium cannabinum
Other: sole host/prey

Foodplant / spot causer
pycnidium of Septoria coelomycetous anamorph of Septoria eupatorii causes spots on fading leaf of Eupatorium cannabinum

Foodplant / saprobe
effuse colony of Sporidesmium dematiaceous anamorph of Sporidesmium cookei is saprobic on dead stem of Eupatorium cannabinum
Remarks: season: 9-5

Foodplant / saprobe
effuse colony of Sporidesmium dematiaceous anamorph of Sporidesmium eupatoriicola is saprobic on dead stem of Eupatorium cannabinum
Remarks: season: 3-10

Foodplant / saprobe
colony of Stachybotrys dematiaceous anamorph of Stachybotrys dichroa is saprobic on dead stem of Eupatorium cannabinum
Remarks: season: 4-9

Foodplant / saprobe
sunken apothecium of Stictis stellata is saprobic on dead stem (woody) of Eupatorium cannabinum
Remarks: season: 10-5

Foodplant / internal feeder
larva of Trupanea stellata feeds within capitulum of Eupatorium cannabinum
Remarks: Other: uncertain

Foodplant / miner
larva of Trypeta artemisiae mines leaf of Eupatorium cannabinum

Foodplant / miner
larva of Trypeta zoe mines leaf of Eupatorium cannabinum

Foodplant / miner
larva of Vidalia cornuta mines leaf of Eupatorium cannabinum
Other: sole host/prey

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Species: 2
Species With Barcodes: 1

Rounded Global Status Rank: GNR - Not Yet Ranked

Canada

Rounded National Status Rank: NNA - Not Applicable

United States

Rounded National Status Rank: NNA - Not Applicable

Common and widespread: not threatened (3).

This species is not threatened at present.

Conservation action is not required for this common species.

Comments: Exotic in North America (Kartesz, 1999).