The four sepals are arranged symmetrically, an outer median and an inner lateral pair.
Sepals transformed into leaves.
2), which is also dioecious, the small male flowers are borne in large numbers in shortstalked spathes; the petals are minute and scalelike, and only two of the three stamens are fertile; the flowers become detached before opening and rise to the surface, where the sepals expand and form a float bearing the two projecting semi-erect stamens.
From the upper rim of the receptacle are given off the five sepals, the five petals, and the very numerous stamens.
They are distinguished by having one of the five blue or yellow coloured sepals (the posterior one) in the form of a helmet; hence the English name monkshood.