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To a spetsial complex reflection group, equipped with a root lattice in thesense of Nebe, we attach a certain finite set playing a role which is analogousto the role of the set of unipotent classes of an algebraic group. In the caseof imprimitive groups, we give a combinatoric parametrization of it in terms ofMalle-Shoji generalized symbols. This result provides a link between the worksof Shoji on Green functions for complex reflection groups and of Broue, Kim,Malle, Rouquier, et. al. on the cyclotomic Hecke algebras and their families ofcharacters.    A un groupe de reflexions complexe spetsial, muni d'un reseau radiciel ausens de Nebe, nous associons un certain ensemble fini qui doit jouer un roleanalogue a celui de l'ensemble des classes unipotentes d'un groupe algebrique.Dans le cas des groupes imprimitifs, nous en donnons un parametragecombinatoire en termes des symboles generalises de Malle et Shoji. Ce resultatfournit un lien entre les travaux de Shoji sur les fonctions de Green pour lesgroupes de reflexions complexes et ceux de Broue, Kim, Malle, Rouquier, et al.sur les algebres de Hecke cyclotomiques et leurs familles de caracteres.

Repr\'esentations de Springer pour les groupes de r\'eflexions complexes imprimitifs