Temporal range: Early Cretaceous - Recent
|Primula hortensis, a eudicot|
|Clades (APG III)|
The Eudicots, Eudicotidae or Eudicotyledons are a monophyletic clade o flouerin plants that haed been cried tricolpates or non-magnoliid dicots bi previous authors. The botanical terms wur introduced in 1991 bi evolutionary botanist James A. Doyle an paleobotanist Carol L. Hotton tae emphasize the later evolutionary divergence o tricolpate dicots frae earlier, less specialized, dicots. The close relationships amang flouerin plants wi tricolpate pollen grains wis initially seen in morphological studies o shared derived characters. These plants hae a distinct trait in thair pollen grains o exhibitin three colpi or grooves parallelin the polar axis. Later molecular evidence confirmed the genetic basis for the evolutionary relationships amang flouerin plants wi tricolpate pollen grains an dicotyledonous traits. The term means "true dicotyledons" as it contains the majority o plants that hae been considered dicots an hae characteristics o the dicots. The term "eudicots" haes subsequently been widely adoptit in botany tae refer tae ane o the twa lairgest clades o angiosperms (constitutin ower 70% o angiosperm species), monocots bein the ither. The remainin angiosperms are sometimes referred tae as basal angiosperms or paleodicots but these terms hae nae been widely or consistently adoptit as thay dae nae refer tae a monophyletic group.
The ither name for the eudicots is tricolpates, a name which refers tae the grooved structur o the pollen. Members o the group hae tricolpate pollen, or fairms derived frae it. These pollen hae three or mair pores set in furrows cried colpi. In contrast, maist o the ither seed plants (that is the gymnosperms, the monocots an the paleodicots) produce monosulcate pollen, wi a single pore set in a differently orientit groove cried the sulcus. The name "tricolpates" is preferred bi some botanists in order tae avoid confusion wi the dicots, a non-monophyletic group (Judd & Olmstead 2004).
Numerous faimiliar plants are eudicots, includin mony common fuid plants, trees, an ornamentals. Some common an faimiliar eudicots include members o the sunflower faimily such as the common dandelion, the forget-me-nae, cabbage an ither members o its faimily, aiple, buttercup, maple an macadamie. Maist leafy trees o mid-latitudes an aa belang tae eudicots, wi notable exceptions bein magnolies an tulip trees which alang tae magnoliids, an Ginkgo biloba which is nae an angiosperm.
The name "eudicots" (plural) is uised in the APG seestem, o 1998, an APG II seestem, o 2003, for classification o angiosperms. It is applied tae a clade, a monophyletic group, which includes maist o the (umwhile) dicots.
References[eedit | eedit soorce]
- Endress, Peter K. (Oct. - Dec., 2002). "Morphology and Angiosperm Systematics in the Molecular Era". Botanical Review. Structural Botany in Systematics: A Symposium inMemory of William C. Dickison 68 (4).