Flowering is not localized, and flowering stems revert back to vegetative growth at the end of the flowering period. The major part of the plant does not function in sole support of the production of flowers. Flowers closing during the day and opening in the evening. The period of fertility lasts for one or two days. Calyx has a ridge or seam at the point of attachment at the base, and falls away with the corolla, the persistent base ultimately forming a membranous disk, cup, or reflexed frill around the bottom of the mature fruit.
Flowers remain open during the day and throughout the fertile period.
Period of fertility lasts from four to six days. Calyx has no ridge or seam around the base, either falling away entirely or forming a persistent husk-like structure around the mature fruit. The capsule is borne on a short stalk in an erect, suberect, or nodding position. Fruit in most species have a mechanism to open spontaneously when ripe, and often split into definite sections. Fruit lacking any mechanism to split open when ripe.