This lifeform is found widely in Eurasia. This lifeform is widespread in North America.

Tickseed or Bur-Marigold (Bidens cernua) is a common marsh plant found throughout many of the northern states. The flower of this plant frequently lacks the yellow petals (bracts). The sessile (without leaf stalks) strongly serrated lanceolate leaves are from three to six inches long and less than one inch wide. They are frequently connate (the paired leaves appear to be connected to each other around the stem). Previously, this species was considered two related species. Bidens cernua has yellow bracts, and Bidens laevis is without the yellow bracts. In the fall the barbed seeds of this plant are certain to stick to ones' clothing.

Bidens genus (Tickseeds) is a group of sunflower-like plants with an unusual method of seed dispersal.  After blooming the plants create seeds with small barbs that attach to animal fur and also to human clothes.  Normally,  these seeds are removed at a different locations permitting the species to spread.  Several of these species are difficult to identify correctly.  Some species have yellow rays,  other species lack the yellow rays,  other species have said yellow rays on an optional basis.  Many of the species are found in swamps, bogs, and along shores of rivers and lakes.  Bidens is primarily a tropical New World genus of about 200 species with several species in North America.  Kartesz lists 48 species, 1 hybrid, and 26 subspecies  growing in greater North America, including the United States, Hawaii, Puerto Rico, U.S. Virgin Islands, and Greenland.

Sunflower Tribe (Heliantheae) is a large tribe that contains the sunflowers, tickseeds, and ragweeds. Brown and Britton separates the ragweeds from this group, raising them to a family status.

Composite or Daisy or Aster Family (Compositae or Asteraceae) is a huge family of perhaps over 20,000 species. Sometimes the Chicory portion of this family is treated as a separate family.  Here the Chicory group is treated as the most advanced tribe in the Composite Family. (The tribes are as suggested by Lawrence in his book, Taxonomy of Vascular Plants.)  

Many species of this family are characterized by large flower heads composed of many very small flowers and leaves that appear as petals (bracts). These cause the large flower heads to appear as a single large flower. The center of the "flower" of a common sunflower contains a multitude of tiny flowers.  

To facilitate study of this large and complicated family, the Composites are usually broken down into different tribes:

        1    Vernoninae
        2    Eupatorieae
        3    Astereae          Asters and Goldenrods, etc.
        4    Inuleae
        5    Heliantheae       Sunflowers, etc.
        6    Helenieae
        7    Anthemideae
        8    Senecioneae
       11    Cynareae           Thistles
       13    Cichoriacea        Dandelions

There are over 20,000 species arranged in about 1,300 genera in this family.

As of 1994, there were about 2,700 species in almost 400 genera either native to or established in greater North America, including Puerto Rico, the Virgin Islands, Hawaii, and Greenland.

Campanulate is a large order usually divided into six different  families. The largest of these is the Aster (Composite) Family.

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.