Overview
(L. trachia: windpipe, trachea; Gr. phyton: plant) A division of plants comprising green plants with a vascular system that contains tracheids or tracheary elements, being the Pteridophyta and Spermatophyta, commonly called vascular plants.
Photos
Taxonomy
The Phylum Tracheophyta is further organized into finer groupings including:
- Subphylum (5): Euphyllophytina · Lycophytina · Pteridophytina · Rhyniophytina · Trimerophytina
- Infraphylum (5): Filices · Lycophytae · Moniliformopses · Psilophytae · Radiatopses
- Class (17): Cycadopsida · Equisetopsida · Filicopsida · Ginkgoopsida · Gnetopsida · Lagenostomopsida · Liliopsida · Lycopsida · Magnoliopsida · Marattiopsida · Pinopsida · Polypodiopsida · Psilotopsida · Pteridospermopsida · Rhyniopsida · Trimerophytopsida · Zosterophyllopsida
- Species: ZipcodeZoo has pages for 720,640 species, subspecies, varieties, forms, and cultivars in the Phylum Tracheophyta.
Classes
Cycadopsida
Cycads are a group of characterized by a large crown of compound leaves and a stout trunk. They are evergreen, gymnospermous, dioecious plants having large pinnately compound leaves. They are frequently confused with and mistaken for palms or ferns, but are related to neither, belonging to the division Cycadophyta. [more]
Equisetopsida
Equisetopsida, or Sphenopsida, is a of plants with a fossil record going back to the Devonian. Living species are commonly known as horsetails and typically grow in wet areas, with needle-like leaves radiating at regular intervals from a single vertical stem. Equisetopsida is placed in the botanical division of ferns (Pteridophyta), though sometimes regarded as a separate division Equisetophyta (also as Sphenophyta or Arthrophyta). [more]
Filicopsida
Ginkgoopsida
A Class in the Kingdom Plantae. [more]
Gnetopsida
The division Gnetophyta or gnetophytes comprise three related families of woody plants grouped in the gymnosperms. The gnetophytes differ from other gymnosperms in having vessel elements as in the flowering plants. [more]
Lagenostomopsida
Liliopsida
Lycopsida
Lycopodiopsida is a class of plants often loosely grouped as the , and includes the clubmosses. Lycopodiopsida traditionally included all the clubmosses, including Selaginella and Isoetes. However, subdivisions within the Division Lycopodiophyta are now considered ancient enough to warrant higher-level separation in accordance with cladistics. [more]
Magnoliopsida
Marattiopsida
Pinopsida
The conifers, division Pinophyta, also known as division Coniferophyta or Coniferae, are one of 13 or 14 level taxa within the Kingdom Plantae. Pinophytes are gymnosperms. They are cone-bearing seed plants with vascular tissue; all extant conifers are woody plants, the great majority being trees with just a few being shrubs. Typical examples of conifers include cedars, douglas-firs, cypresses, firs, junipers, kauris, larches, pines, redwoods, spruces, and yews. The division contains approximately eight families, 68 genera, and 630 living species. Although the total number of species is relatively small, conifers are of immense ecological importance. They are the dominant plants over huge areas of land, most notably the boreal forests of the northern hemisphere, but also in similar cool climates in mountains further south. While tropical rain forests have more biodiversity and turnover, the immense conifer forests of the world represent the largest terrestrial carbon sink, i.e. where carbon is bound as organic compounds. They are also of immense economic value, primarily for timber and paper production; the wood of conifers is known as softwood. [more]
Polypodiopsida
The Pteridopsida is a class of in the Division Pteridophyta that includes all the leptosporangiate ferns. In the recent 2006 classification by Smith et al. the class is renamed Polypodiopsida. This recent reclassification of Monilophyte (ferns) is based on multiple molecular studies published since 1994 that have clarified some of the confusion of the placement and relations among fern families. Polypodiopsida is one of four classes of Monilophytes (an Infradivision, this rank is not recognized by the International Code of Botanical Nomenclature), the other three being Marattiopsida, Equisetopsida, and Psilotopsida.
[more]
Psilotopsida
Psilotopsida is a class of -like plants. As circumscribed by Smith et al. (2006) it contains two families, Psilotaceae and Ophioglossaceae, placed in orders Psilotales and Ophioglossales, respectively. The affinities of these two groups have long been unclear and a close relationship between them has only recently been confirmed through molecular systematic studies. Psilotopsida is the sister-group to all other ferns (including Marattiaceae and Equisetaceae). [more]
Pteridospermopsida
Rhyniopsida
Trimerophytopsida
Zosterophyllopsida
At least 272 species and subspecies belong to the Class Zosterophyllopsida.
More info about the Class Zosterophyllopsida may be found here.
Sources
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