Article révisé par les pairs
Résumé : Sixteen morphological and life history characters were studied. Cultivation in untrampled conditions suggested that the differentiation observed in the field could be entirely accounted for by phenotypic plasticity. Shoot length and all variables describing metamer components were highly positively correlated with each other, and showed a marked decrease in relation to trampling intensity. Biomass allocation to reproduction showed a positive response to trampling. -from Authors