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Bennettitales (the cycadeoids) is an extinct order
Order (biology)

In Biological classification used in biology, the order is a taxonomic rank between class and family . The superorder is a rank between class and order....
 of seed plants
Spermatophyte

The spermatophytes comprise those plants that produce seeds. They are a subset of the embryophytes or land plants. The living spermatophytes form five groups:...
 that first appeared in the Triassic
Triassic

The Triassic is a geologic period that extends from about 251 to 199 annum . As the first period of the Mesozoic Era, the Triassic follows the Permian and is followed by the Jurassic....
 period and became extinct toward the end of the Cretaceous
Cretaceous

The Cretaceous , usually abbreviated K for its German translation Kreide, is a geologic period from circa to million years ago . In the geologic timescale, the Cretaceous follows on the Jurassic period and is followed by the Paleogene period....
. Some were characterized by thick trunks and pinnate
Pinnate

Pinnate is a term used to describe feather-like or multi-divided features arising from both sides of a common axis in plant or animal structures, and comes from the Latin word pinna for "feather"....
ly compound leaves that bore a superficial resemblance to those of cycads, differing primarily in stomatal arrangement.

It comprises two groups, the Cycadeoidaceae, represented by Cycadeoidea, Cycadella, and Monanthesia which had stout trunks and bisporangiate strobili
Conifer cone

A cone is an organ on plants in the division Pinophyta that contains the plant sexuality structures. The familiar woody cone is the female cone, which produces seeds....
 (cones serving as their reproductive
Sexual reproduction

Sexual reproduction is characterized by processes that pass a Genetic recombination of Genetics material to offspring, resulting in Genetic diversity....
 structures), and the Williamsoniaeae including Williamsonia
Williamsonia

Williamsonia is also a genus of Corduliidae dragonfliesWilliamsonia is a fossil genus of Bennettitales, an extinct group of spermatophyte....
, Williamsoniella, Wielandella and Ischnophyton which had slender, branching trunks and either bisporangiate or monosporangiate strobili.






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Bennettitales (the cycadeoids) is an extinct order
Order (biology)

In Biological classification used in biology, the order is a taxonomic rank between class and family . The superorder is a rank between class and order....
 of seed plants
Spermatophyte

The spermatophytes comprise those plants that produce seeds. They are a subset of the embryophytes or land plants. The living spermatophytes form five groups:...
 that first appeared in the Triassic
Triassic

The Triassic is a geologic period that extends from about 251 to 199 annum . As the first period of the Mesozoic Era, the Triassic follows the Permian and is followed by the Jurassic....
 period and became extinct toward the end of the Cretaceous
Cretaceous

The Cretaceous , usually abbreviated K for its German translation Kreide, is a geologic period from circa to million years ago . In the geologic timescale, the Cretaceous follows on the Jurassic period and is followed by the Paleogene period....
. Some were characterized by thick trunks and pinnate
Pinnate

Pinnate is a term used to describe feather-like or multi-divided features arising from both sides of a common axis in plant or animal structures, and comes from the Latin word pinna for "feather"....
ly compound leaves that bore a superficial resemblance to those of cycads, differing primarily in stomatal arrangement.

It comprises two groups, the Cycadeoidaceae, represented by Cycadeoidea, Cycadella, and Monanthesia which had stout trunks and bisporangiate strobili
Conifer cone

A cone is an organ on plants in the division Pinophyta that contains the plant sexuality structures. The familiar woody cone is the female cone, which produces seeds....
 (cones serving as their reproductive
Sexual reproduction

Sexual reproduction is characterized by processes that pass a Genetic recombination of Genetics material to offspring, resulting in Genetic diversity....
 structures), and the Williamsoniaeae including Williamsonia
Williamsonia

Williamsonia is also a genus of Corduliidae dragonfliesWilliamsonia is a fossil genus of Bennettitales, an extinct group of spermatophyte....
, Williamsoniella, Wielandella and Ischnophyton which had slender, branching trunks and either bisporangiate or monosporangiate strobili. Bennettitales have been placed among the anthophytes, which for some time were considered to be close relatives of the flowering plant
Flowering plant

The flowering plants or angiosperms are the most widespread group of Embryophytes. The flowering plants and the gymnosperms are the only extant groups of Spermatophyte....
s on account of their flower-like structures. However, more detailed morphological studies have shown the "anthophytes" to be polyphyletic, with the bennetitales more closely related to the cycads, ginkgo
Ginkgo

Ginkgo , frequently misspelled as "Gingko", and also known as the Maidenhair Tree after Adiantum, is a unique species of tree with no close living relatives....
 and conifers than to the angiosperms.

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