Bennettitales

Bennettitales are an extinct order of seed plants widespread during the Mesozoic. They bore cycad-like leaves and distinctive reproductive structures, some resembling flowers.

Seed plant: A plant that reproduces through seeds rather than spores. Bennettitales belong to this broad group of vascular plants.
Bennettitalean reproductive structure: A reproductive organ of Bennettitales, often composed of ovules and pollen-bearing parts on a shared axis. These organs distinguish Bennettitales from plants with similar foliage.
Triassic: The geologic period from about 252 to 201 million years ago, following the Permian. Bennettitales appeared by the Triassic, early in their long fossil history.
Williamsoniaceae: A family of bennettitalean plants, commonly associated with slender trunks and exposed reproductive structures. Its members exemplify one major form of Bennettitales.
Gymnosperm: A seed plant whose seeds are not enclosed within an ovary. Bennettitales are generally classified among extinct gymnosperms.
Williamsonia: An extinct bennettitalean genus known for distinctive reproductive structures, often preserved separately from foliage. Its exposed reproductive organs show the range of Bennettitalean structure.
Jurassic: The geologic period from about 201 to 145 million years ago, between the Triassic and Cretaceous. Bennettitales were especially widespread in Jurassic floras.
Bennettitaceae: A family of bennettitalean plants, often characterized by stout trunks and reproductive organs among leaf bases. Its fossils preserve a different growth form from many Williamsoniaceae.
Cycad: A group of living and extinct seed plants with large compound leaves and cone-like reproductive structures. Cycads resemble Bennettitales in foliage, but their reproductive structures differ.
Cycadeoidea: An extinct bennettitalean genus with stout trunks and reproductive structures embedded among leaf bases. Its anatomy preserves reproductive organs in close association with the trunk.

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