Quercus oblongifolia

Torrey in L. Sitgreaves

in L. Sitgreaves, Rep. Exped. Zuni Colorado Rivers, 173, plate 19. 1853.

Common names: Sonoran blue oak
Illustrated
Treatment appears in FNA Volume 3.

Trees, evergreen, to 10 m. Bark gray or whitish, closely furrowed. Twigs light-brown, 1-1.5 mm diam., densely or sparsely stellate-tomentose, soon glabrate. Buds reddish-brown, subspheric to broadly ovoid, 1-2 mm, glabrous or basal scales pubescent; stipules persistent about terminal buds. Leaves: petiole 2-5 (-8) mm. Leaf-blade oblong to elliptic, occasionally lanceolate or ovate, (20-) 30-60 (-80) × (5-) 10-25 (-30) mm, base cuneate to cordate, margins entire, undulate, sometimes irregularly toothed especially toward apex, secondary-veins 7-8 (-10) on each side, branched, apex acute or broadly rounded; surfaces abaxially densely and loosely glandular-tomentose, quickly glabrate or persistently floccose, especially about base of midrib, at maturity strongly glaucous, adaxially dull pale green, bluish green, or glaucous, sparsely stellate-tomentose, quickly glabrate. Acorns solitary or paired, subsessile or on peduncle 4-12 mm; cup cupshaped, about 6-8 (-13) mm deep × 10-13 mm wide, enclosing ca. 1/3 nut, scales to 1-1.5 mm wide, moderately, regularly tuberculate near base of cup, gray-pubescent; nut light-brown, ovoid or oblong, 12-17 (-19) × (7-) 10-12 mm, glabrate or puberulent about apex. Cotyledons connate.


Phenology: Flowering in spring.
Habitat: Common in high grasslands and midelevation woodlands, mesas, and canyons
Elevation: 1300-1650 m

Distribution

V3 809-distribution-map.gif

Ariz., N.Mex., Tex., Mexico (Baja California South), Mexico (Sonora), Mexico (Chihuahua), Mexico (and Coahuila)

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Quercus oblongifolia"
on peduncle +  and subsessile +
paired +  and solitary +
rounded +  and acute +
Kevin C. Nixon +
Torrey in L. Sitgreaves +
whitish;gray +
bluish green +  and pale green +
glabrate +, stellate-tomentose +  and glaucous +
cuneate;cordate +
reddish-brown +
subspheric +  and broadly ovoid +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
2-6-lobed +
pistillate +, capitate +  and spicate +
Sonoran blue oak +
starchy +  and fleshy +
cup-shaped +
×10-13 +, 6mm +  and 8mm +
multibracteate +, spiny +  and scaly +
Ariz. +, N.Mex. +, Tex. +, Mexico (Baja California South) +, Mexico (Sonora) +, Mexico (Chihuahua) +  and Mexico (and Coahuila) +
1300-1650 m +
pistillate +  and staminate +
biennial +, annual +  and maturation +
1-seeded +  and winged +
in groups +  and enclosed +
Common in high grasslands and midelevation woodlands, mesas, and canyons +
pistillate +, spicate +  and staminate +
tomentulose +  and glabrate +
6 cm60 mm <br />0.06 m <br /> (8 cm80 mm <br />0.08 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (3 cm30 mm <br />0.03 m <br />) +
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
oblong +  and elliptic occasionally lanceolate or ovate +
arranged +  and alternate +
toothed +  and undulate +
1.7 cm17 mm <br />0.017 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
light-brown +
1.2 cm12 mm <br />0.012 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
puberulent +  and glabrate +
oblong +  and ovoid +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Flowering in spring. +
in L. Sitgreaves, Rep. Exped. Zuni Colorado Rivers, +
connate +  and distinct +
gray-pubescent +
few-to-many +
tuberculate +
reduced +
0.1 cm1 mm <br />0.001 m <br /> (?) +  and 0.15 cm1.5 mm <br />0.0015 m <br /> (?) +
Illustrated +
inconspicuous +
distinct +
subulate +  and dilated +
enlarged +
floccose +, glabrate +  and glandular-tomentose +
Quercus oblongifolia +
Quercus sect. Quercus +
species +
spheric +  and ovoid terete or angled +
bristle-tipped +
light-brown +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
glabrate +  and stellate-tomentose +