Noun | 1. | ![]() reproductive structure - the parts of a plant involved in its reproduction fir cone - the seed-producing cone of a fir tree galbulus - the seed-producing cone of a cypress tree pinecone - the seed-producing cone of a pine tree conifer, coniferous tree - any gymnospermous tree or shrub bearing cones horsetail - perennial rushlike flowerless herbs with jointed hollow stems and narrow toothlike leaves that spread by creeping rhizomes; tend to become weedy; common in northern hemisphere; some in Africa and South America |