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The eudicots, Eudicotidae, ... In contrast, most of the other seed plants (that is the gymnosperms, the monocots and the paleodicots) produce monosulcate pollen, with ...
The eudicots are the largest monophyletic group within the dicotyledons. They are distinguished from all other flowering plants by the structure of their pollen. Other dicotyledons and the monocotyledons have monosulcate pollen (or derived forms): grains with a single sulcus.
[17] [14] Eudicots have pollen with three colpi or with shapes that are evolutionarily derived from tricolpate pollen. [18] The evolutionary trend in plants has been from monosulcate to polycolpate or polyporate pollen. [14] Additionally, gymnosperm pollen grains often have air bladders, or vesicles, called sacci.
The basal eudicots are a group of 13 related families of flowering plants in four orders: Buxales, Proteales, Ranunculales and Trochodendrales. [1] [a] Like the core eudicots (the rest of the eudicots), they have pollen grains with three colpi (grooves) or other derived structures, [4] and usually have flowers with four or five petals (sometimes multiples of four or five, sometimes reduced or ...
At least some putative monocot fossils have been found in strata as old as the eudicots. [100] The oldest fossils that are unequivocally monocots are pollen from the Late Barremian – Aptian – Early Cretaceous period, about 120-110 million years ago, and are assignable to clade - Pothoideae -Monstereae Araceae; being Araceae, sister to other ...
The top level category for the Eudicots — a clade of angiosperms (flowering plants) in the APG IV system (2016).; Most entries should be put in one of the subcategories of the clade (orders, families, genera and species)., but a small number of articles relating to orders, families or genera too small to have their own categories are put directly here.
In phylogenetic nomenclature, the Pentapetalae are a large group of eudicots that were informally referred to as the "core eudicots" in some papers on angiosperm phylogenetics. [2] They comprise an extremely large and diverse group accounting for about 65% of the species richness of the angiosperms , with wide variability in habit , morphology ...
They are arranged spirally around the pin axis. Each microsporophyll carries on its underside (abaxial side) a variety of pollen sacs. These open with slots, from which the pollen then escapes. The pollen grains are streamlined and have only one germ line (monosulcate). The male cones fall off after one year.