Cmagnus's Garlic: German White
Allium sativum

According to the folks at Gourmet Garlic:
German White, very is also known as German Extra-Hardy, Northern White and German Stiffneck is a large, beautiful and well-formed porcelain garlic. These are all the same garlic but grown in different places under different names. Its flavor is very strong and robust and sticks around for a long time.

From a growers perspective, it is a tall dark green plant and is a very good survivor, usually grows healthy and appears to be somewhat resistant to many of the diseases that can affect garlic. It originally came from Germany but grows well in all but the most southerly states, where it is marginal.