Figure 5.

Location of maximum degree nodes within reproductive structures through time. (a) Maximum degree as a function of the number of attachment edges away from the sporangium for all free-sporing, pollen-producing and seed-producing reproductive structures. (b) maximum degree location within only the seed-producing structures of gymnosperms (left), all angiosperms (centre), and early-diverging angiosperm lineages (left; ANA grade plus Chloranthaceae). Nymphaeaceae are generally resolved as sister to a grade of Cabombaceae and Hydatellaceae. Each line represents an individual reproductive structure colour coded by age. Values at zero distance represent the sporangium itself.