Populus deltoides subsp. wislizeni

(S. Watson) Eckenwalder

J. Arnold Arbor. 58: 205. 1977.

Common names: Rio Grande cottonwood álamillo
Basionym: Populus fremontii var. wislizeni S. Watson Amer. J. Sci. Arts, ser. 3, 15: 136. 1878 (as fremonti)
Synonyms: Populus wislizeni (S. Watson) Sargent
Treatment appears in FNA Volume 7. Treatment on page 19. Mentioned on page 17, 18.
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Plants to 35 m, usually less than 20 m. Winter buds pubescent, hairs relatively short, stiff. Leaves: 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. Pedicels: lengths uniform, (5–)8–12(–15 in fruit) mm. Capsules with thick, stiff valves.


Phenology: Flowering Mar–May; fruiting May–Jul.
Habitat: Floodplains, permanent streams, near springs, usually in moist soil, often planted near ranches, irrigation ditches, in towns
Elevation: 1000-2300 m

Distribution

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Ariz., Colo., N.Mex., Tex., Utah, Wyo., Mexico (Chihuahua).

Discussion

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.

Selected References

None.

Lower Taxa

None.
James E. Eckenwalder +
(S. Watson) Eckenwalder +
Populus fremontii var. wislizeni +
Rio Grande cottonwood +  and álamillo +
Ariz. +, Colo. +, N.Mex. +, Tex. +, Utah +, Wyo. +  and Mexico (Chihuahua). +
1000-2300 m +
Floodplains, permanent streams, near springs, usually in moist soil, often planted near ranches, irrigation ditches, in towns +
Flowering Mar–May +  and fruiting May–Jul. +
J. Arnold Arbor. +
Weedy +  and Illustrated +
Populus wislizeni +
Populus deltoides subsp. wislizeni +
Populus deltoides +
subspecies +