Populus fremontii subsp. mesetae

Eckenwalder

J. Arnold Arbor. 58: 201, fig. 2B. 1977.

Common names: Plateau cottonwood álamo cimarron
Synonyms: Populus deltoides var. mesetae (Eckenwalder) Cronquist
Treatment appears in FNA Volume 7. Treatment on page 20. Mentioned on page 16.

Plants to 20 m. Branchlets, leaf-blades, and petioles usually densely hairy, hairs (soft) yellowish. Neoformed leaves: blade rhombic-ovate, longer than wide, base cuneate or truncate, apex long-acuminate. Capsules 5–8 (–10) mm.


Phenology: Flowering Feb–Apr; fruiting Apr–Jun.
Habitat: Stream banks, canyons, seeps, springs, pools, moist soils
Elevation: 800-2400 m

Distribution

V7 13-distribution-map.gif

Tex., Mexico (Chihuahua), Mexico (Coahuila), Mexico (Mexico), Mexico (Nuevo León), Mexico (Puebla)

Discussion

Subspecies mesetae forms groves and local patches along major streams, otherwise primarily in arroyos and canyons in foothills, and also is commonly planted near ranches and in towns. It intergrades with subsp. fremontii along a line from southeastern Arizona south along the boundary between Chihuahua and Sonora.

Selected References

None.

Lower Taxa

None.
James E. Eckenwalder +
Eckenwalder +
truncate +  and cuneate +
8 cm80 mm <br />0.08 m <br /> (14 cm140 mm <br />0.14 m <br />) +
8 cm80 mm <br />0.08 m <br /> (11 cm110 mm <br />0.11 m <br />) +
4 cm40 mm <br />0.04 m <br /> (8 cm80 mm <br />0.08 m <br />) +
longer than wide +
rhombic-ovate +
3cm;8cm +
deciduous +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
glabrate or +  and sparsely densely hairy +
1.8 cm18 mm <br />0.018 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
resinous +
yellowbrown +
flowering +
1.1 cm11 mm <br />0.011 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
spherical +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
(10-)15-25(-35)-flowered +
3 cm30 mm <br />0.03 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
4.5 cm45 mm <br />0.045 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Plateau cottonwood +  and álamo cimarron +
saucer--shaped +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
cup-shaped +
Tex. +, Mexico (Chihuahua) +, Mexico (Coahuila) +, Mexico (Mexico) +, Mexico (Nuevo León) +  and Mexico (Puebla) +
800-2400 m +
pistillate +  and staminate +
bisexual +  and unisexual +
Stream banks, canyons, seeps, springs, pools, moist soils +
unbranched +  and spicate +
terminal +  and axillary +
arranged +  and alternate +
marcescent +
deciduous +
2-4-carpelled +
spherical +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
6 cm60 mm <br />0.06 m <br /> (9 cm90 mm <br />0.09 m <br />) +
flattened +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
Flowering Feb–Apr +  and fruiting Apr–Jun. +
J. Arnold Arbor. +
hairy +  and glabrous +
0.4 cm4 mm <br />0.004 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Illustrated +
branched +, sympodial +, monopodial +  and branching +
erect;pendent +
plate-like +
expanded +
distinct +
persistent +  and deciduous +
yellowish green +
Populus deltoides var. mesetae +
Populus fremontii subsp. mesetae +
Populus fremontii +
subspecies +
1.1 cm11 mm <br />0.011 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
37 cm370 mm <br />0.37 m <br /> (?) +