Definition of houstonia in US English:



  • Any plant of the North American genus Houstonia (family Rubiaceae), comprising low-growing plants with delicate four-lobed flowers of various colours, and including the bluet, H. caerulea, commonly grown in gardens for its pale blue and yellow flowers. Also (in form Houstonia): the genus itself.


Mid 18th century; earliest use found in John Hill (bap. 1714, d. 1775), physician and actor. From scientific Latin Houstonia (Linnaeus Species plantarum I. 105) from the name of William Houston, botanist + scientific Latin -ia.