In some plants, as many Saxifragaceae, a there are intermediate forms, in which the term half-inferior is applied to the ovary, whilst the floral whorls are halfsuperior.
Numerous intermediate forms occur, especially amongst Saxifragaceae, where the parts are half superior or half inferior.
The curious pitcher-plant, Cephalotus follicularis, comprises a separate natural order Cephalotaceae, closely allied to the Saxifragaceae.
The plants of which the floral organs or perfect fruits are preserved include the amber-bearing Pinus succinifera, Smilax, Phoenix, the spike of an aroid, i i species of oak, 2 of chestnut, a beech, Urticaceae, 2 cinnamons and Trianthera among the Lauraceae, representatives of the Cistaceae, Ternstroemiaceae, Dilleniaceae (3 species of Hibbertia), Geraniaceae (Geranium and Erodium), Oxalidaceae, Acer, Celastraceae, Olacaceae, Pittosporaceae, Ilex (2 species), Euphorbiaceae, Umbelliferae (Chaerophyllum), Saxifragaceae (3 genera), Hamamelidaceae, Rosaceae, Connaraceae, Ericaceae (Andromeda and Clethra), Myrsinaceae (3 species), Rubiaceae, Sambucus (2 species), Santalaceae, Loranthaceae (3 species).