URTICACEAE, Nettle Family

Herbs, sometimes with stinging hairs; leaves simple; stipules present or absent; flowers hypogynous, staminate and carpeU\llate in separate or in the same inflorescences, sometimes mixed with bisporangiate ones, or staminate and carpellate flowers on separate plants; flowers in cymose clusters often aggregated in spikes, panicles, or glomerules; periantb (here called calyx) of 3-5 parts, separate or united; stamens usually 4; carpel 1; style 1 or absent; stigma often brushlike; ovary 1-loculed, with I ovule; fruit an achene.