December 10
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Subspecies

A major division of a species, ranking above variety and forma, though used by some botanists instead of variety. A subspecies may be thought of as a species still in the process of evolving but not yet reproductively isolated from its sister subspecies except by geography; there are usually intermediate plants where subspecies adjoin. The ?type? subspecies takes the same epithet as the species, thus Acer saccharum is divided into 6 or more subspecies including subsp. saccharum and subsp. grandidentatum, each subspecies occurring in a different region of North America. Abbreviated to ?subsp.? or ?ssp.?.

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