Raspberries are part of the plant order Rosales, many species of plants in this order are cultivated for their fruit.
The two main allergens identified in raspberry are Rub i 1 and Rub i 3. Rub i 1 is an allergen in the Bet v 1 family, which can cause oral allergy syndrome.
I have put together some more comprehensive resources at http://www.allergyresources.co.uk/Raspberry.php
The allergy resources page for raspberry covers the key allergens, which allergic syndromes are linked to this allergy and other foods which are commonly cross reactive with raspberry.
There is also regularly updated links to useful websites specifically for raspberry 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.