Aconitum, commonly called aconite, monkshood or wolfsbane, is a genus of perennial flowering plants in the buttercup family (Ranunculaceae). The genus (Aconitum) contains roughly 250 species and is native to temperate zones of the Northern Hemisphere, especially mountainous regions of Europe, Asia and North America. Many species form upright spikes of distinctive helmet-shaped flowers in shades of blue, purple, yellow or white.

Description and characteristics

Aconitum species are herbaceous perennials with palmately divided leaves and a clumping rootstock. Flowers are zygomorphic: the upper sepal forms a hood or "monkshood" that gives the plants their common name. Stems can reach 0.5–1.5 m tall depending on species. Flower structure and leaf shape vary among species, which complicates identification and taxonomy.

  • Habit: clumping, erect perennial herbs.
  • Leaves: alternate, deeply divided, often glossy.
  • Flowers: hooded sepal, nectar-producing, insect-pollinated.
  • Roots: tuberous or rhizomatous in many species.

Toxicity, chemistry and risks

Aconitum contains potent alkaloids such as aconitine that affect nerve and heart function. All parts of many species are toxic if ingested and can be absorbed through the skin, so handling with bare hands is not recommended. Symptoms of poisoning reported in clinical literature include numbness or tingling, nausea, vomiting, low blood pressure, arrhythmias and respiratory difficulty; severe exposures can be fatal. Medical treatment is supportive and focuses on stabilizing breathing and circulation; decontamination and antiarrhythmic therapy may be used under clinical supervision.

Because of its toxicity, aconite has a long history as both a poison and a carefully prepared medicinal agent. Some traditional systems, including parts of Chinese herbal medicine, use processed Aconitum roots after special detoxification methods. Historically, the plant was used on hunting arrows and in folklore as a means to repel wolves, hence the name "wolfsbane."

In modern horticulture several species and hybrids are valued for their tall, architectural flower spikes and late-summer bloom. Gardeners prize monkshood for shaded borders and moisture-retentive soils, but campaigns for safe planting emphasize placement away from children and pets and use of gloves when pruning. For identification, cultivation advice and conservation status consult specialized floras or local authorities via the links above.