It attains a height of 3ft. in favourable quarters, and has both a wealth of rich foliage and showy one-sided spikes of white flowers; the latter are neatly formed and continue to develop along the spike for the length of a foot; the flowers are ½in. across, somewhat star-shaped, having five, and sometimes six, divisions of the corolla, which are oval and cupped; the short flower stalk is supported by a very narrow bracteole of equal length -- this helps not a little to enrich the yet unblossomed part of the spike, the buds of which are of the purest whiteness and pearl-shape, mounted in the claw-like setting of the pale green calyx; these pleasing spikes of flowers and buds have a peculiar habit of bending; the unbloomed part is at right angles with the erect stem, with the exception of the tip, which slightly erects itself; the angle is ever changing, being ruled by the change of flower to seed, the development causing the sharp bend to rise day by day.    From Wordnik.com.  [Hardy Perennials and Old Fashioned Flowers Describing the Most Desirable Plants, for Borders, Rockeries, and Shrubberies.] Reference