From The Collaborative International Dictionary of English v.0.48 :
Halesia \Ha*le"si*a\ (h[.a]*l[=e]"zh[i^]*[.a]), n. [NL.] (Bot.)
A genus of American shrubs containing several species, called
snowdrop trees, or silver-bell trees. They have showy,
white flowers, drooping on slender pedicels.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
Halesia
n 1: deciduous small trees or shrubs of China and eastern North
America [syn: Halesia, genus Halesia]