Vesselless angiosperms are Wintera, Trochodendron etc. Secondary growth is absent in some angiosperms. Angiospermic plants are autotrophic in nutrition. But some angiosperms are heterotrophic in nutrition. The 4 special modes of nutrition and their examples include:
(i) Saprophytic : e.g. Neottia, Monotropa.
(ii) Symbiotic – e.g. Mycorrhiza-between fungus and roots of higher plants.
(iii) Parasitic – Cuscuta.
(iv) Insectivorous plant – Nepenthes. Double fertilization is characteristic of all angiosperms.