Narrative

This lifeform is only found domesticated.

Hydrangea genus is native to North and South America, the Orient, and Indonesia. There are about 25 to 35 species in this genus. These plants can be bushes, small trees, or even climbing plants. The leaves are generally opposite, simple, and with petioles. These plants are unusual in that they have flower clusters that include outer sterile flowers. There were five species established in greater North America as of 1994.

Saxifrage Family (Saxifragaceae) contains herbs, bushes, and trees found throughout the world. There are about 650 to 1200 species in this family. There is controversy over the limits of this family as various authors define it differently. For example, the Hydrangea and Philadelphus group is frequently given separate family status in the Hydrangeaceae family. The Ribes group is also frequently given family status in the Grossulariaceae family. Kartesz shows 174 species in the Saxifrage family; another 52 species in the Hydrangea family, and another 57 species in the Grossulariaceae family growing in greater North America.)

Rose Group (Order Rosales) contains many large and very important families. Included here are fruit trees in the family Rosaceae, the nitrogen fixing plants like clover and alfalfa (in the family Leguminosae), and a large assemblage of plants divided into over fifteen different 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 (Aster) 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.