An Atlas of the World's Conifers: An Analysis of Their by Aljos Farjon

By Aljos Farjon

A 2014 selection journal "Outstanding educational identify" "An Atlas of the realm s Conifers" is the 1st ever atlas of all recognized conifer species. it's a complete paintings describing the common distribution, biogeography, range and conservation prestige of the conifers on all continents."

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Extra info for An Atlas of the World's Conifers: An Analysis of Their Distribution, Biogeography, Diversity, and Conservation Status

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36 north america Conifer diversity in North America (N of Mexico) is substantial at the level of genera and species, but only represented by three families, Cupressaceae, Pinaceae and Taxaceae. The 17 genera are divided among the families as follows: nine in Cupressaceae, six in Pinaceae and two in Taxaceae. The genera in Cupressaceae are Calocedrus, Chamaecyparis, Cupressus, Juniperus, Sequoia, Sequoia­ dendron, Taxodium, Thuja and Xanthocyparis. In Pinaceae the genera are Abies, Larix, Picea, Pinus, Pseudotsuga and Tsuga.

Apparently, geological and other circumstances induced speciation in this ancestor in Mexico to a much greater extent than in W North America. The species of subsection Strobi (Farjon, 2005b) form a well supported clade and divide into two subclades, one with American species and one with Eurasian species. Looking at the distribution of these, it appears that this small group of closely related species (‘white pines’ in forester’s parlance) has succeeded to spread just as widely across the Northern Hemisphere as the genus itself.

Of all these, only two are endemic to North America, Sequoia and Sequoiadendron, each with a single extant species. Like most of the other 15 genera, these two were widespread in the Northern Hemisphere before the ice ages of the Pleistocene. There is indeed a strong element of circum-boreal distribution in the North American conifer flora, represented by genera such as Abies, Larix, Picea, Pinus, Juniperus and Taxus. Other genera represent an East Asian/North American distribution pattern that is well publicized for angiosperm trees since the days of Asa Gray in the 19th century.

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