Hybrid and Cultivated Orchids have been separated here from their wild counterparts. If an orchid is frequently grown and apt to be encountered in a hybrid form, it has been included in this group. As this choice was arbitrary, it is advisable to consult other resources for the various geographic subdivisions of this family. Reference Pridgeon observes that the first artificial orchid flowered in England in 1856. He also notes that the number of registered hybrids is now around 100,000.

Orchids (Family Orchidaceae) are a worldwide group of 15,000 to 30,000 species and contains some of the most exotic of North American wildflowers and some of the most exotic tropical flowers of  the world. Author Griffiths estimates 17,500 species and author Pridgeon estimates from 25,000 to 30,000 species. This family also contains many very tiny species that have yet to be described in the tropics. Certain species have been the basis for some very exotic hybrid flowers.

Microspermae is a worldwide order generally broken into two families: the Burmannia and Orchids.

Monocots are a large group of plants usually characterized by having leaves with parallel veins and a seed with a single shell. Most flowers are created with multiples of three. In  the older botany texts, the Monocots were considered more primitive than the Dicots. However, many recent authors have placed the Monocots as an offshoot of the primitive Dicots. Here they are placed before the Dicots.

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.