Anemonoides nemorosa

Typical flower

Anemonoides nemorosa is a rhizomatous herbaceous perennial plant less than 30 centimetres (12 in) in height. The compound basal leaves are palmate or ternate (divided into three lobes).[2]^:106 They grow from underground root-like stems called rhizomes and die back down by mid summer (summer dormant).

The plants start blooming in spring, March to May in the British Isles[3]^:28 soon after the foliage emerges from the ground. The flowers are solitary, held above the foliage on short stems, with a whorl of three palmate or palmately-lobed leaflike bracts beneath. The flowers are 2 centimetres (0.8 in) diameter, with six or seven (and on rare occasions eight to ten) tepals (petal-like segments) with many stamens. In the wild the flowers are usually white but may be pinkish, lilac or blue, and often have a darker tint on the backs of the tepals.

The native range of Anemonoides nemorosa extends across Europe to western Asia, reaching as far south as the Caucasus Mountains in Turkey. It has been introduced into New Zealand and elsewhere.[1] In North America, there are naturalized populations at well-known sites in Newfoundland, Quebec, and Massachusetts.[5][6]

A. nemorosa is often found in shady woods.[4] The species is common in the British Isles[3] but it spreads very slowly there, by as little as six feet per century, so it is often used as an indicator for ancient woodland.[7]

Pollination

The flowers are pollinated by insects, especially hoverflies.[8] The seeds are achenes.[2]

Many cultivars have been selected for garden use, The RHS Plant Finder 2008–2009 lists 70 cultivars sold by nurseries in the UK. Some of the most widely available are:

Anemonoides × lipsiensis with its parents

• 'Alba Plena' - double white
• 'Allenii'agm[9] - large lavender-blue flowers, often with seven petals (named after James Allen, nurseryman)
• 'Bowles' Purple' - purple flowers (named after E.A. Bowles, plantsman and garden writer)
• 'Bracteata Pleniflora' - double, white flowers, with green streaks and a frilly ruff of bracts
• 'Robinsoniana'agm[10] - pale lavender-blue flowers (named after William Robinson, plantsman and garden writer)
• 'Royal Blue' - deep blue flowers with purple backs
• 'Vestal'agm[11] - white, anemone-centred flowers
• 'Virescens'agm[12] - flowers mutated into small conical clusters of leaves

Those marked agm are recipients of the Royal Horticultural Society's Award of Garden Merit.

Anemonoides × lipsiensis, a hybrid between A. nemorosa and A. ranunculoides,[13] has pale yellow flowers; A. × lipsiensis 'Pallida' is the best-known result of this cross. It has also been awarded the AGM.[14]

The plant contains poisonous chemicals that are toxic to animals including humans, but it has also been used as a medicine. All parts of the plant contain protoanemonin, which can cause severe skin and gastrointestinal irritation, bitter taste and burning in the mouth and throat, mouth ulcers, nausea, vomiting, diarrhea, and hematemesis.[15]

• 
  Form
• 
  Colonial growth
• 
  Double-flowered cultivar
• 
  Pink-flowered plant in Germany
• 
  Flowers with six, seven, eight and nine tepals

• Shirreffs, D. A. 1985. Anemone nemorosa L. Journal of Ecology 73: 1005-1020.
• Philip, C. Plant Finder 2008-2009. ISBN 978-1-4053-3190-6.
• Plantlife - Wood Anemone