From The Collaborative International Dictionary of English v.0.48 :
Amelanchier \Amelanchier\ n.
1. 1 a genus of North American deciduous trees or shrubs.
Syn: genus Amelanchier.
[WordNet 1.5]
From WordNet (r) 3.0 (2006) :
Amelanchier
n 1: North American deciduous trees or shrubs [syn:
Amelanchier, genus Amelanchier]