The aerial distribution of the pollen grains Cassia species was found
to be predominant in Kerala and Tamil Nadu, the adjacent states of Sou
th India. The present study deals with the allergenicity and biochemic
al aspects of four different species of Cassia which were found to be
dominant in the atmosphere of India. The pollen grains of Cassia occid
entalis were found to be the most and Cassia roxburghii the least reac
tive of the four different species studied. The individual analysis of
the reactive patients also showed the possibilities of cross-reactivi
ty. The protein, carbohydrate and amino acids of these members were an
alysed. The results obtained are useful as a step towards standardisat
ion of allergen extracts of Cassia species and are also worthy of furt
her investigations both in relation to cross-reactivity and characteri
sation of allergens.