equisetum life cycle. diagram of life cycle of horsetail equisetum arvense with dioecious gametophyte

antheridium archegonium arvense asexual background biology botany change cycle developing development diagram dioecious diploid drawing equisetum fertilisation fertilization flora gamete gametophyte germinating germination grass green grow growing growth horsetail illustration isolated life nature plant process protonema puzzlegrass reproduction snake sperm sporangia spore sporophyte stage strobilus vector vegetation white