1. A genus of small flowering plants in the Rubiaceae family, native to North America, characterized by delicate four-petaled flowers.
Usage: botanical; often capitalized when referring to the genus

Examples

• The houstonia blooms in spring with tiny white and blue flowers.
• Houstonia caerulea, commonly called bluet, is a popular wildflower in eastern North America.
• The delicate houstonia flowers attract small pollinators to the garden.
• Gardeners often cultivate houstonia for its charming appearance in rock gardens.
• The genus houstonia was named after William Houston, an 18th-century botanist.