HAPLOID-DIPLOID LIFE CYCLE. “Unlike animals, land plants undergo an alternation of generations, producing multicellular bodies in both haploid (1n: gametophyte) and diploid (2n: sporophyte) generations. Plant body plans in each generation are regulated by distinct developmental programs initiated at either meiosis or fertilization, respectively.”
http://www.sciencedirect.com/science/article/pii/S1534580713000427