The lower lip is extended and prominent, drooping. There are four stamens and the anthers are hairy. The size of the blooms and how they are displayed depends upon the species. The flowers are in pairs, usually arranged in racemes. When not in flower the plants present excellent foliage.
Color can range from a dark, rich lustrous green to a downy light gray.
Leaf edges can be smooth, rounded toothed to serrated. Occasionally the leaf margin will have a band of burgundy. Overall shape can range from narrow to ovate. There are cultivars selected for the display of color around the leaf edge. Hardy Herbaceous Perennials Vol.