Pinidae is a subclass of

Equisetopsida Equisetidae is one of the four subclasses of Polypodiopsida (ferns), a group of vascular plants with a fossil record going back to the Devonian. They are commonly known as horsetails. They typically grow in wet areas, with whorls of needle-like ...

in the sense used by Mark W. Chase and

James L. Reveal James Lauritz Reveal (March 29, 1941 – January 9, 2015) was a U.S. botanist best known for his contributions to the genus '' Eriogonum'' and for his work on suprageneric names. His website, at PlantSystematics.org, also presents material on plan ...

in their 2009 article "A phylogenetic classification of the land plants to accompany

APG III APG is an abbreviation with several different meanings: * Aberdeen Proving Ground, a United States Army installation in Aberdeen, Maryland, also ** Phillips Army Airfield, the airfield of the above, from its IATA airport code * Aboriginal Provisiona ...

." This subclass comprises the

conifer Conifers are a group of conifer cone, cone-bearing Spermatophyte, seed plants, a subset of gymnosperms. Scientifically, they make up the phylum, division Pinophyta (), also known as Coniferophyta () or Coniferae. The division contains a single ...

s. The Pinidae subclass is equivalent to the division

Pinophyta Conifers are a group of cone-bearing seed plants, a subset of gymnosperms. Scientifically, they make up the division Pinophyta (), also known as Coniferophyta () or Coniferae. The division contains a single extant class, Pinopsida. All extan ...

and class

Pinopsida Conifers are a group of cone-bearing seed plants, a subset of gymnosperms. Scientifically, they make up the division Pinophyta (), also known as Coniferophyta () or Coniferae. The division contains a single extant class, Pinopsida. All extan ...

of previous treatments. There are over 600 species of Pinidae all over the world.

Phylogeny

The following diagram shows a likely phylogenic relationship between subclass Pinidae and the other Equisetopsida subclasses.

References

Plant subclasses Equisetopsida sensu lato {{Conifer-stub