Etymology: Hesperis: from "evening" for evening fragrance of the flower
Plants: erect, biennial/perennial, 2'-3' tall forb; stems often with upper branches
Leaves: upper leaves not clasping
Flowers: purple to white, 4-parted, 3/4" wide, fragrant; inflorescence a loose cluster (raceme) of stalked flowers; blooms May-Sept.
Fruits: long, thin pod narrowing between the large seeds; stout, widely-spreading stalks
Habitat: full to partial sun; disturbed sites, woods, roadsides
Invasiveness: Restricted Invasive - Eradicate!
Conservation Status: Introduced - naturalized; ecologically invasive

Flora of North America: Flora of North America WIS DNR-Bureau of Endangered Resources: Detailed information on Wisconsin invasive species including decription, habitats, control methods USDA Plants Database: Federal Distribution and detailed information including photos University of Wisconsin - Green Bay: Invasive Plants: Photos, descriptions, information USDA Agricultural Research Service (ARS): Images of seeds, fruits, embryos, etc. David G. Smith's "Delaware Wilflowers": Beautiful photographs; descriptions Dan Tenaglia's The Missouri Flora: Fabulous photographs; detailed descriptions; color and leave arrangement key. Illinois Wildflowers: Wonderful photographs; detailed descriptions; color and leaf arrangement key