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knobcone pine

Habit Trees to 30 m tall; mature crown conic to rounded, often many branched.
Buds

oblong-ovoid, dark brown, resinous.

Leaves

in clusters of 3; straight to slightly curved, twisted, 8–14 cm × 1–2 mm; yellowish green;

margins serrulate; all surfaces with white stomatal bands;

apex sharp callous-tipped;

sheaths persistent.

Pollen cones

ellipsoid, 10–15 mm long, light brown to orange brown.

Seeds

oblong-oval; sharp pointed, 6–7 mm long; black;

wings 3 times as long as body.

Trunks

to 1 m in diameter; straight;

bark purplish to dark brown; smooth when young, shallowly fissured into scaly plates when mature;

branches ascending;

twigs dark yellow brown, roughened by bud-scales.

Seed cones

oblique-ovoid; very asymmetric, 6–15 cm long, light brown to reddish brown, reflexed to recurved;

stalks less than 1 cm long, maturing in 2 years, remaining closed for several decades or opening at burning;

umbos central; pyramidal; sharp pointed, prickled.

2n

=24.

Pinus attenuata

Pinus resinosa

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

Chaparral. 300–1600 m. Casc, Est, Sisk, WV. CA; south to Mexico. Native.

The cones of this species will generally not open unless exposed to the heat of fire. Pinus attenuata × radiata plantations have been planted in Oregon.

Source Flora of Oregon, volume 1, page 120
Stephen Meyers
Sibling taxa
P. albicaulis, P. attenuata x Pinus radiata, P. balfouriana, P. contorta, P. flexilis, P. jeffreyi, P. lambertiana, P. monophylla, P. monticola, P. muricata, P. pinaster, P. ponderosa, P. sabiniana, P. sylvestris
P. albicaulis, P. attenuata, P. attenuata x Pinus radiata, P. balfouriana, P. contorta, P. flexilis, P. jeffreyi, P. lambertiana, P. monophylla, P. monticola, P. muricata, P. pinaster, P. ponderosa, P. sabiniana, P. sylvestris
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