heterophylla at various times and by various authors. elliottii was, however, short-lived, with slash pine being named P. elliottii in honour of Elliott, whose name for it was cited as a synonym. In a revision of the genus Pinus, George Engelmann (1880) published a detailed description of the new species, naming it P. Stephen Elliott in 1824 was the first botanist to distinguish slash pine, naming it P. elliottii) and the South Florida slash pine (var. Leaves in this group occur in groups of 2-3 in fascicles, with biform hypodermis, endodermis with a thin outer cell wall, and with internal resin ducts ( Little and Critchfield, 1969). Pinus elliottii belongs to subgenus Pinus, section Australes.
Shaw's original subdivision of these groups has been reworked by different authorities (e.g., Pilger, 1926 Duffield, 1952 Ferre, 1965 Landry, 1974, 1978), but botanists in recent years have generally recognized the classification described by Little and Critchfield ( Little and Critchfield, 1969 Critchfield, 1986), who recognize three subgenera: (1) Ducampopinus (one species: P. This division is based on the presence of one or two vascular bundles in the leaves, respectively. The genus Pinus was first classified on evolutionary characteristics by Shaw (1914), and most taxonomists have since followed his general separation of the genus into two groups: section/subgenus Haploxylon or Strobus, and Diploxylon or Pinus, commonly called the "soft" (or "white") and "hard" pines, respectively.
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