Populus fremontii subsp. fremontii

Illustrated
Synonyms: Populus arizonica Sargent Populus fremontii var. arizonica (Sargent) Jepson Populus fremontii var. macdougalii (Rose) Jepson Populus fremontii var. pubescens Sargent Populus fremontii var. thornberi Sargent Populus fremontii var. toumeyi Sargent Populus macdougalii
Treatment appears in FNA Volume 7. Treatment on page 20. Mentioned on page 16.

Plants to 30 m. Branchlets, leaf-blades, and petioles glabrous or glabrate to densely hairy, hairs whitish. Neoformed leaves: blade broadly-triangular-ovate, usually about as wide as long, rarely wider, base truncate or cordate, apex short-acuminate. Capsules (6–) 7.5–11 mm.


Phenology: Flowering Feb–May; fruiting Mar–Jun.
Habitat: Floodplains, canyons, springs, other moist places
Elevation: (-60-)0-1500 (-2200) m

Distribution

V7 12-distribution-map.gif

Ariz., Calif., Idaho, Nev., N.Mex., Utah, Mexico (Baja California), Mexico (Baja California Sur), Mexico (Sonora)

Discussion

Subspecies fremontii is the common cottonwood of southwestern North America west of the Continental Divide. It intergrades with subsp. mesetae along a line from southeastern Arizona south along the border between Chihuahua and Sonora.

Selected References

None.

Lower Taxa

None.
at right angle;plane +
short-acuminate +
James E. Eckenwalder +
S. Watson +
cordate +  and truncate +
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 />) +
broadly-triangular-ovate +
3 cm30 mm <br />0.03 m <br /> (8 cm80 mm <br />0.08 m <br />) +
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 />) +
0.6 cm6 mm <br />0.006 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
spherical +
0.75 cm7.5 mm <br />0.0075 m <br /> (1.1 cm11 mm <br />0.011 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 />) +
saucer--shaped +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
cup-shaped +
Ariz. +, Calif. +, Idaho +, Nev. +, N.Mex. +, Utah +, Mexico (Baja California) +, Mexico (Baja California Sur) +  and Mexico (Sonora) +
(-60-)0-1500 (-2200) m +
pistillate +  and staminate +
bisexual +  and unisexual +
Floodplains, canyons, springs, other moist places +
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 />) +
glabrate +  and densely hairy +
flattened +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
Flowering Feb–May +  and fruiting Mar–Jun. +
Proc. Amer. Acad. Arts +
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 +
glabrescent;pubescent +
plate-like +
expanded +
distinct +
persistent +  and deciduous +
yellowish green +
Populus arizonica +, Populus fremontii var. arizonica +, Populus fremontii var. macdougalii +, Populus fremontii var. pubescens +, Populus fremontii var. thornberi +, Populus fremontii var. toumeyi +  and Populus macdougalii +
Populus fremontii subsp. fremontii +
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 /> (?) +