Populus deltoides subsp. wislizeni
Populus deltoides subsp. deltoides
Rio Grande cottonwood, álamillo
eastern cottonwood, southern cottonwood
blade base with 0 basilaminar glands, apex short-acuminate, abaxial surface glabrous at emergence; preformed blade with (3–)5–10 teeth on each side; neoformed blade lengths usually less than widths.
blade base usually with 3–6 tubular basilaminar glands, apex short-acuminate, abaxial surface pilose at emergence; preformed blade with (6–)12–20(–30) teeth on each side; neoformed blade lengths usually distinctly greater than widths.
lengths uniform, (5–)8–12(–15 in fruit) mm.
lengths graded, shorter from base to apex, 1–13(–17 in fruit) mm.
with thick, stiff valves.
with thin, flexible valves.
Populus deltoides subsp. wislizeni
Populus deltoides subsp. deltoides
Subspecies wislizeni is the common cottonwood of the Rio Grande and Colorado Plateau regions, where it forms relatively small, scattered groves. It is a fairly homogeneous and distinctive southwestern part of the species. It intergrades with subsp. monilifera on the eastern and northern margins of its range. Populus sargentii Dode var. texana Correll is based upon such intergrades.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Southern cottonwoods are nearly ubiquitous, although varying greatly in abundance, throughout the southeastern United States. They are among the fastest growing and largest trees in the region and are the basis for local poplar plantation forestry rather than hybrids used in other regions. Subspecies deltoides intergrades rather freely with subsp. monilifera up the Mississippi River drainage system, and traces of its morphological influence may be found as far north as Minnesota and Wisconsin (E. Marcet 1962).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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