This family is made up of 300 genus and 7,500 species. Plants very important from a financial point of view belong to this family: Hevea Brasiliensis (Latex is obtained from its sap), Manihot Suculenta (manioc), Ricinus communis (used as medicinal plant), Euphorbia pulcherrima (Poinsettia), etc.
Pollens from Mercurialis and to a lesser extent Castor-oil plant produce allergy frequently.

Mercurialis (Mercurialis annua)
t is a grass that can reach 40 cm. of height, and that is common both in urban and rural environments.

Its pollen has a spheroidal-elliptical shape, small-medium size (22-30 x 19-27 µm of diameter), three pores, and a surface that is somewhat reticulated.
This plant, unlike the majority, pollinates from October to May. So patients allergic to this pollen have symptoms outside the season regarded as usual (spring).