From The Collaborative International Dictionary of English v.0.48 :
Umbellularia \Um*bel`lu*la"ri*a\, prop. n. [NL. See
Umbellule.] (Zool.)
A genus of deep-sea alcyonaria consisting of a cluster of
large flowerlike polyps situated at the summit of a long,
slender stem which stands upright in the mud, supported by a
bulbous base.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
Umbellularia
n 1: aromatic evergreen trees of Pacific coast [syn:
Umbellularia, genus Umbellularia]