This lifeform is found widely in Eurasia. This lifeform is widespread in North America. This lifeform is locally common in suitable environments.

Teasel (Dipsacus sylvestris) is an Eurasian weed that is spreading in the United States. The long narrow leaves help separate this species from Dipsacus laciniatus.

Dipsacus (teasel) genus is native to Eurasia and northern Africa.  This genus contains about 15 species of biennial or perennial herbs.  In many of the species the basal leaves form cups around the stem that catch water.  There are 3 species now established in North America. The species per  Kartesz are fullonum, laciniatus, and sativus.  (The relationship between sylvestris and fullonum is confusing.  Britton and Brown treated them as two distinct species.  However, Britton and Brown also showed fullonum having a synonym of fullonum var.  sativus. Kartesz shows sativus as a full species and fullonum having two ssp, fullonum and sylvestris.)

Teasel Family (Dipsacaceae) was originally limited to the Old  World with approximately 150 species known worldwide. Several species are now unpleasant weeds in the United States. As of 1994, there were about 13 species in six genera established in greater North America, including Puerto Rico, the Virgin Islands, Hawaii, and Greenland.

Rubiales Order is worldwide with five families.

Dicots (Dicotyledoneae Class) are the predominant group of vascular plants on earth. With the exception of the grasses (Monocots) and the Conifers (Gymnosperms), most of the larger plants that one encounters are  Dicots. Dicots are characterized by having a seed with two outer shell coverings. Some of the more primitive Dicots are the typical hardwood trees (oaks, birches, hickories, etc). The more advanced Dicots include many of the Composite Family flowers like the  Dandelion, Aster, Thistles, and Sunflowers. Although many Monocots reach a very high degree of specialization, most botanists feel that the Dicots represent the most advanced group of plants.

Seed plants (Phylum Embryophyta) are generally grouped into one large phylum containing three major classes: the Gymnosperms, the Monocots, and the Dicots. (Some scientists separate the Gymnosperms into a separate phylum and refer to the remaining plants as flowering plants or Angiospermae.)

For North American counts of the number of species in each genus and family, the primary reference has been John T. Kartesz, author of A Synonymized Checklist of the Vascular Flora of the United States, Canada, and Greenland (1994). The geographical scope of his lists include, as part of greater North America, Hawaii, Alaska, Greenland, Puerto Rico, and the Virgin Islands.

Kartesz lists 21,757 species of vascular plants comprising the ferns, gymnosperms and flowering plants as being found in greater North America (including Alaska, Hawaii, Greenland, Puerto Rico and the Virgin Islands).

There are estimates within the scientific world that about half of the listed North American seed plants were originally native with the balance being comprised of Eurasian and tropical plants that have become established.

Plant kingdom contains a large variety of different organisms including mosses, ferns, and seed plants. Most plants manufacture their energy from sunlight and water. Identification of many species is difficult in that most individual plants have characteristics that have variables based on soil moisture, soil chemistry, and sunlight.

Because of the difficulty in learning and identifying different plant groups, specialists have emerged that study only a limited group of plants. These specialists revise the taxonomy and give us detailed descriptions and ranges of the various species.  Their results are published in technical journals and written with highly specialized words that apply to a specific group.

On the other hand, there are the nature publishers. These people and companies undertake the challenging task of trying to provide easy to use pictures and descriptions to identify those species.