From The Collaborative International Dictionary of English v.0.48 :
Erysimum \Erysimum\ n.
a large genus of annual or perennial herbs of the Old World
and North America; some are grown for their flowers and some
for their attractive evergreen leaves.
Syn: genus Erysimum.
[WordNet 1.5]
From WordNet (r) 3.0 (2006) :
Erysimum
n 1: large genus of annual or perennial herbs some grown for
their flowers and some for their attractive evergreen
leaves; Old World and North America [syn: Erysimum,
genus Erysimum]