Alliaria petiolata is garlic-mustard (as you thought).  It has also been
known as Alliaria officinalis in recent times, so some books may list it by
that name.

Here is the "official" list of synonyms from the Flora Novae Angliae web

Name:  Alliaria petiolata (Bieb.) Cavara & Grande

Synonyms:  Alliaria alliaria (L.) Britt.; Alliaria officinalis Andrz. ex
Bieb.; Erysimum alliaria L.; Sisymbrium alliaria (L.) Scop.

Arthur Haines
Research Botanist
New England Wild Flower Society
(207) 318-4255

-----Original Message-----
From: - JBS-L - Josselyn Botanical Society discussion list of the University
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Sent: Wednesday, April 27, 2005 4:14 PM
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Subject: Re: Know of any garlic mustard sites?

Is this Alliarium petiolata?