Celery-Mugwort-Spice Syndrome is essentially a sub-category of Pollen Food Allergy Syndrome. The body mistakes the shape of a protein that it is already sensitive to (a plant pollen) to a similarly shaped protein in certain fruits, vegetables, spices, herbs, and nuts.
The sensitising pollen is from the mugwort plant and allergic reactions are to foods that contain proteins which are similarly shaped.
In Pollen Food Allergy Syndrome the most common sensitising pollen is Bet v 1, which is an allergen from birch trees. It is also sometimes referred to as a PR-10 protein (where PR means pathogenesis related). In Celery-Mugwort-Spice Syndrome the sensitising allergen is a profilin protein called Art v 4, sometimes also called Bet v 2 proteins.
I have put together some more comprehensive resources at http://www.allergyresources.co.uk/CMS-Syndrome.php
The allergy resources page for Celery Mugwort Spice Syndrome covers the key allergens and which foods which are commonly cross reactive.
There is also regularly updated links to useful websites specifically for Celery Mugwort Spice Syndrome 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.