Dicotyledon

Dicotyledon
Lamium album (white dead nettle)
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms Eudicot Magnoliid Amborella Nymphaeales Austrobaileyales Chloranthales Ceratophyllum
Synonyms
Dicotyledoneae

The dicotyledons, also known as dicots, are one of the two groups of flowering plants (angiosperms). The name refers to their seeds having two embryonic leaves or cotyledons. There are around 200,000 species in this group.^[1]

The other group of flowering plants were called monocotyledons or monocots, with one cotyledon. Historically, these two groups formed the two divisions of the flowering plants.

Sequence analysis showed what botanists already suspected: dicotyledons are not a monophyletic group. They are a number of lines, such as the magnoliids, and groups now known as basal angiosperms. They diverged earlier than the monocots did. The traditional dicots are a paraphyletic group.

The largest clade of the dicotyledons are known as the eudicots. They are definitely monophyletic. They differ from all other flowering plants in the structure of their pollen. Other dicotyledons and monocotyledons have an older type of pollen, whereas eudicots have derived pollen.

1. ↑ Hamilton, Alan; Hamilton, Patrick (2006), Plant conservation : an ecosystem approach, London: Earthscan, p. 2, ISBN 978-1-84407-083-1