Calibrachoa are small shrubs or herbaceous plants with woody shoot axis that grow annual or perennial. The leaves are ovate, elliptic, reverse ovate or linear; its edge is flat or rolled back. The inflorescences are monochasial and have oppositely standing, foliage-like bracts. The flowers are usually zygomorphic, the bud cover is reciprocal in most species, the only exception is Calibrachoa pygmaea in both cases. The calyx has five or ten ribs, it is usually lobed to about the middle, the lobes are usually narrowed towards the top. The crown is funnel-shaped, only in Calibrachoa pygmaea it is salver-shaped, bulbous and tapered towards the tip. The color of the crown can be purple, red, pink or whitish.Hitoshi Watanabe et al: Three Groups of Species in Petunia sensu Jussieu (Solanaceae) inferred from the intact seed morphology . In: American Journal of Botany, Vol. 86, Number 2, 1999, pp. 302-305.
