It is mostly monosymmetry by simplicity, by the presence of only one carpel and/or only one stamen, such as in Hydatellaceae (Hamann, 1975; Saarela et al., 2007; Rudall et al., 2007), Trimeniaceae (Endress, 2001b), Chloranthaceae (Endress, 1987; Kong et al., 2002), Ceratophyllaceae (Endress, 2001b, 2004), some Winteraceae (Igersheim & Endress, 1997), Piperaceae (Tucker, 1984; Tucker et al., 1993),
Degeneriaceae, Myristieaceae (Igersheim & Endress, 1997), Lauraceae (Endress, 1972), and Hernandiaceae (Endress & Lorence, 2004).
Evolution in isolation is responsible for the existence of plants so strange that a new family has had to be created to include them, such as Lactoris fernandeziana, the only member of the Lactoridaceae, which is endemic to the Juan Fernandez Islands, and Degeneria vitiensis, which is endemic to the Fiji Islands and is the only member of the
Degeneriaceae.