Lawsonia

from The Collaborative International Dictionary of English v.0.48

Lawsonia \Law*so"ni*a\, n. (Bot.)
   An Asiatic and North African shrub ({Lawsonia inermis}), with
   smooth oval leaves, and fragrant white flowers. {Henna} is
   prepared from the leaves and twigs. In England the shrub is
   called {Egyptian privet}, and in the West Indies, {Jamaica
   mignonette}.
   [1913 Webster]

from U.S. Gazetteer (1990)

Lawsonia, MD (CDP, FIPS 46100)
  Location: 37.95750 N, 75.84204 W
  Population (1990): 1326 (642 housing units)
  Area: 16.5 sq km (land), 0.1 sq km (water)