The species name, sanguineus, refers to the red leaf veins, which are more likely in cultivated specimens; wild plants tend to have only inconspicuous green veins.
Main flower color:
All of the British Isles; uncommon only in the Scottish Highlands
Up to 100 cm
Woodland margins and clearings
Arranged in well-separated, pendent whorls, not subtended by leaves. The three inner tepals are green, with entire margins, and one has a rounded, pale-coloured wart
Lanceolate, up to 10 cm long, sometimes with reddish veins. Those lower down the stem are heart-shaped at the base. The straight stem branches are ascending, held at angles of around 30 degrees
June to August