Pinus attenuata |
|
---|---|
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 |
|
Distribution | |
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 | |
Web links |