Lipid Transfer Proteins (LTP) are found in many types of plants. You may be allergic to all or some of the foods mentioned in the cross reactivity section.
LTP Syndrome can be confused with Pollen Food Allergy Syndrome (PFAS) as there is a crossover of common trigger foods. In general PFAS symptoms are less severe and give oral allergy type symptoms. Reactions to LTP are more severe and a reaction is elicited from foods that have been cooked.
I have put together some more comprehensive resources at http://www.allergyresources.co.uk/LTP.php
The allergy resources page for LTP syndrome covers which foods are commonly cross reactive.
There is also regularly updated links to useful websites specifically for lipid transfer proteins 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.