Only the lower leaves have the typical 3- or 5-lobed hemp-type leaves, which are in opposite pairs ; the upper leaves are just single oval in opposite pairs. All leaves are oval, pointed and toothed.

No relation to : Agrimony [a plant with similar name]. Nor is it, despite the name, related to Hemp nor to Cannabis, which refers more to the shape and pattern of the leaves than to any psychotropic substances. Nor to Bifid Hemp-Nettle, Common Hemp-nettle, Large-Flowered Hemp-Nettle or Red Hemp-nettle since Hemp-nettles belong to the Mint and Dead-nettle Family.

Grows beside freshwater such as streams, canals, fens and in damp woods. Sometimes in drier places.

Uniquely identifiable characteristics

Distinguishing Feature : The leaves in opposite pairs of three with the umbel of pinkish-red flowers atop.

Hemp Agrimony contain the poisons Euparin, some sesquiterpene lactones including Eupatoriopicrin and several Pyrrolizidine Alkaloids. All parts of the plant are poisonous, ingestion of which results in tremor, delirium and death. Pyrrolizidine Alkaloids will alkylate DNA molecules, and are therefore mutagenic, carcinogenic. Euparin is a benzofuran or benzopyran which is phytotoxic and inhibits electron transfer in chloroplasts, which suggests that the plant has some internal use for it. Eupatoriopicrin may exhibit anti-tumour activity.

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