Final answer:
The dense blazing star (Liatrus spicata) and the purple coneflower (Echinacea purpurea) are two common plants in the Asteraceae family. They are known for their inflorescence which might look like a single flower but is actually a cluster of many.
Step-by-step explanation:
Two common plants that belong to the Asteraceae family are the dense blazing star (Liatrus spicata) and the purple coneflower (Echinacea purpurea). Both of these flowering plants share a basic morphological structure, despite their varied appearance, indicating their evolution from a common ancestor. Members of the Asteraceae family, also commonly referred to as the aster or sunflower family, typically possess characteristic inflorescences that appear as a single flower, although they are actually clusters of multiple flowers. Examples include the familiar dandelion and sunflowers, which are easily recognizable by their flower arrangement.