Allium ampeloprasum (*)
Allium ampeloprasum, L.
USDA, NRCS. 2006. The PLANTS Database, 6 March 2006 (http://plants.usda.gov). Data compiled from various sources by Mark W. Skinner. National Plant Data Center, Baton Rouge, LA 70874-4490 USA.
Allium ampeloprasum is a member of the onion genus Allium, in the family Alliaceae. The wild plant is commonly known as (Broadleaf) Wild Leek - not to be confused with the N. American Allium tricoccum of the same name. Its native range is S. Europe to W. Asia, and seems to have been introduced to Britain by prehistoric people, where its habitat consists of rocky places near the coast in south-west England and Wales. It has been differentiated into three cultivated vegetables, namely leek, elephant garlic and kurrat. In tidewater Virginia, the plant is commonly known as the “Yorktown Onion.” 
Allium porrum L.
Allium ampeloprasum comprises several vegetables, of which the most important ones are known as
* leek (English), poireau (French), alho porro (Portuguese);
1. ^ Plants for a Future: Allium ampeloprasum
Source: Wikispecies, Wikipedia: All text is available under the terms of the GNU Free Documentation License