There are 3 key allergens associated with pea allergy, Pis s 1, Pis s 2 and Pis s 3. These are a vicilin protein, a convicilin protein and a lipid transfer protein (LTP).
I have put together some more comprehensive resources at http://www.allergyresources.co.uk/Pea.php
The allergy resources page for pea covers the key allergens, which allergic syndromes are linked to this allergy and other foods which are commonly cross reactive with peas .
There is also regularly updated links to useful websites specifically for pea allergies and the latest research papers on the topic.
If you have multiple allergies and are interested in how they are linked or want to find out more about food allergies outside the usual top 14 then you can follow me on Facebook or Twitter, where I share a food allergy card every day of the week.