Houstonia longifolia Gaertn.  
Family: Rubiaceae
long-leaved bluets
Houstonia longifolia image
Kitty Kohout  
Etymology: Houstonia: for Dr. William Houston, English botanist, who collected in Tropical America
Plants: erect, perennial, 3"-10" tall forb, several stems often branching toward the top
Leaves: all stalkless, opposite, widely linear to narrowly oblong, mostly smooth
Flowers: blue-purple to white, 4-parted, 1/4"-1/3" wide, tubular with a funnel-shaped mouth, hairy throat; inflorescence a terminal, branched cluster (cyme) of many, short-stalked, crowded flowers; blooms June-Aug.
Fruits: rounded capsule
Habitat: dry; prairie, barrens; in rocky, sandy soil
Conservation Status: Native
Houstonia longifolia image
Merel R. Black  
Houstonia longifolia image
Merel R. Black  
Houstonia longifolia image
Robert R. Kowal  
Houstonia longifolia image
Kitty Kohout  
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