Eupatorium cannabinum explained

Eupatorium cannabinum, commonly known as hemp-agrimony, or holy rope, is a herbaceous plant in the family Asteraceae. It is a robust perennial native to Europe, NW. Africa, Turkey, Syria, Iran, Iraq, Jordan, the Caucasus and Central Asia.[1] [2] [3] It is cultivated as an ornamental and occasionally found as a garden escape in scattered locations in China,[4] the United States and Canada.[5] [6] It is extremely attractive to butterflies, much like buddleia.[7]

If the genus Eupatorium is defined in a restricted sense (about 42 species), E. cannabinum is the only species of that genus native to Europe (with the remainder in Asia or North America).[8]

Description

Eupatorium cannabinum is a perennial herb up to 1.5abbr=offNaNabbr=off tall or more and 1.2abbr=offNaNabbr=off wide.[3] The plant has a dark red or purplish stem, covered in small hairs. It lives in moist low-lying areas in temperate Eurasia. It is dioecious, with racemes of mauve flower heads which are pollinated by insects from July to early September. The flowers are visited by many types of insects, and can be characterized by a generalized pollination syndrome.[9] The flower heads are tiny, fluffy and can be pale dusty pink or whitish.[3] The fruit is an achene about 2 or 3 mm long, borne by a pappus with hairs 3 to 5 mm long, which is distributed by the wind. The plant over-winters as a hemicryptophyte.[8]

Toxicity

Eupatorium cannabinum contains tumorigenic pyrrolizidine alkaloids.[10] The alkaloids may be present in the plant material as their N-oxides.[11]

Pharmacology

Chemistry and use in European folk medicine

Eupatorium cannabinum is used in the European traditional medicine as anti-inflammatory agent for respiratory tract diseases, and several of its sesquiterpene lactone constituents were identified to have anti-inflammatory effect in isolated human neutrophils, with the anti-inflammatory action of the sesquiterpene lactone eupatoriopicrin being verified also in mouse peritonitis model.[12]

Use to stop bleeding in folk medicine of Sikkim

E. cannabinum, known locally by the Nepali names of Banmara and Kalijhar, is used as a styptic in the traditional medicine of the Indian state of Sikkim in the Eastern Himalayas (to which the plant is not native, but an introduction).[13] [1]

The leaves and tender stems are crushed fresh and the juice is applied to cuts and bruises. Sometimes, when the wound is large, the squeezed remains of the plant are placed over the wound in the form of a poultice. The bleeding stops immediately and the wound is protected from infection. [13]

Subspecies

Notes and References

  1. Kew Plants of the World Online https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:205581-1 Retrieved at 12.31 on Friday 13/1/23.
  2. http://luirig.altervista.org/flora/taxa/index1.php?scientific-name=eupatorium+cannabinum Altervista Flora Italiana, Holy Rope, gewöhnlicher Wasserdost, hampflockel, Canapa acquatica
  3. "Botanica. The Illustrated AZ of over 10000 garden plants and how to cultivate them", p 359. Könemann, 2004.
  4. http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200023930 Flora of China, Eupatorium cannabinum Linnaeus, 1753. 大麻叶泽兰 da ma ye ze lan
  5. Web site: Eupatorium cannabinum. Flora of North America.
  6. http://bonap.net/MapGallery/County/Eupatorium%20cannabinum.png Biota of North America Program 2014 county distribution map
  7. https://www.wildlifetrusts.org/wildlife-explorer/wildflowers/hemp-agrimony Wildlife Trusts - Hemp Agrimony
  8. Schmidt . Gregory J. . Schilling . Edward E. . 2000 . Phylogeny and biogeography of Eupatorium (Asteraceae: Eupatorieae) based on nuclear ITS sequence data . . 87 . 5. 716–726 . 10.2307/2656858 . 2656858 . 10811796 . free .
  9. 10.1111/plb.12328. 25754608. Competition for pollinators and intra-communal spectral dissimilarity of flowers. Plant Biology. 18. 1. 56–62. 2016. Van Der Kooi. C. J.. Pen. I.. Staal. M.. Stavenga. D. G.. Elzenga. J. T. M..
  10. Fu, P.P., Yang, Y.C., Xia, Q., Chou, M.C., Cui, Y.Y., Lin G., "Pyrrolizidine alkaloids-tumorigenic components in Chinese herbal medicines and dietary supplements", Journal of Food and Drug Analysis, Vol. 10, No. 4, 2002, pp. 198-211 https://www.nlfd.gov.tw/en/ch/MultiMedia_FileDownload.ashx?guid=304d1580-c6aa-4502-900e-cab744c31985
  11. Woerdenbag. H. J.. October 1986. Eupatorium cannabinum L.. Pharmaceutisch Weekblad Scientific Edition. en. 8. 5. 245–251. 10.1007/bf01960068. 3537953. 26403365. 0167-6555.
  12. Michalak . B . Piwowarski . JP . Granica . S . Waltenberger . B . Atanasov . AG . Khan . SY . Breuss . JM . Uhrin . P . Żyżyńska-Granica . B . Stojakowska . A . Stuppner . H . Kiss . AK . Feb 2019 . Eupatoriopicrin Inhibits Pro-inflammatory Functions of Neutrophils via Suppression of IL-8 and TNF-alpha Production and p38 and ERK 1/2 MAP Kinases . J. Nat. Prod. . 82 . 2. 375–385 . 10.1021/acs.jnatprod.8b00939 . 30653318 .
  13. Rai, Lalitkumar and Sharma, Eklabyar Medicinal Plants of the Sikkim Himalaya: Status, Uses and Potential, pub. Govind Ballabh Pant Inst. Bishen Singh & Mahendra Pal Singh 1994 page 39.

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