Plants of this genus include herbs,shrubs, andtrees.They range in height from about 0.5 to 3 meters (1.5 to 10 feet).[10]The herbage is generally hairy to woolly or bristly.[11]The leaf blades are usually entire, but the occasional species has lobed leaves. They are palmately veined and have wavy or serrated edges. Flowers are solitary, paired, or borne in smallinflorescencesin the leaf axils or toward the branch tips. Thecalyxis bell-shaped with five lobes. The corolla is usually bell-shaped to wheel-shaped, with fivepetalsjoined at the bases.
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