OregonFlora: Pinus strobiformis vs. Pinus

	Pinus strobiformis	Pinus
		pine
Habit		Trees evergreen; mature crowns conic to irregular.
Bark		smooth when young, becoming fissured with age; branches whorled, ascending to descending; twigs generally resinous.
Leaves		simple, alternate; in clusters of 2–5; square in cross section or 2–3-angled and rounded on abaxial surface; apex acute; sheath deciduous or persistent.
Pollen cones		in clusters.
Seed cones		maturing in 2(3) years, pendent to erect, conic to cylindric; scales persistent; bracts included.

	Pinus strobiformis	Pinus
Distribution	[WildflowerSearch map] [BONAP county map]	[BONAP county map]
Discussion		North temperate and mountain regions. Approximately 100 species; 11 species treated in Flora. In Oregon, Pinus species are readily identifed by their leaves in clusters of two to five. Only one other gymnosperm genus in Oregon (Larix) has clustered leaves. The leaves of Larix, however, are in clusters of ten or more and are deciduous. Pinus muricata (Bishop pine) has been collected once in Oregon, in Curry County (1965). Whether this species has historically been present in Oregon or this represents a relatively recent range extension needs further research. It is a two-needled pine, distinguished from P. contorta and P. sylvestris by its larger leaves and cones (both over 5 cm long). Pinus radiata (Monterey pine) is known to occasionally escape near tree plantations where the species is cultivated.
Source		Flora of Oregon, volume 1, page 119 Stephen Meyers
Sibling taxa	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
Subordinate taxa		P. albicaulis, P. attenuata, P. balfouriana, P. contorta, P. flexilis, P. jeffreyi, P. lambertiana, P. monophylla, P. monticola, P. muricata, P. pinaster, P. ponderosa, P. sabiniana, P. sylvestris
Web links	Local Web sites: Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Pinus strobiformis

Pinus

pine

Habit

Trees evergreen; mature crowns conic to irregular.

Bark

smooth when young, becoming fissured with age;

branches whorled, ascending to descending;

twigs generally resinous.

Leaves

simple, alternate; in clusters of 2–5; square in cross section or 2–3-angled and rounded on abaxial surface;

apex acute;

sheath deciduous or persistent.

Pollen cones

in clusters.

Seed cones

maturing in 2(3) years, pendent to erect, conic to cylindric;

scales persistent;

bracts included.

Pinus strobiformis

Pinus

Distribution

[WildflowerSearch map]

[BONAP county map]

Discussion

North temperate and mountain regions. Approximately 100 species; 11 species treated in Flora.

In Oregon, Pinus species are readily identifed by their leaves in clusters of two to five. Only one other gymnosperm genus in Oregon (Larix) has clustered leaves. The leaves of Larix, however, are in clusters of ten or more and are deciduous. Pinus muricata (Bishop pine) has been collected once in Oregon, in Curry County (1965). Whether this species has historically been present in Oregon or this represents a relatively recent range extension needs further research. It is a two-needled pine, distinguished from P. contorta and P. sylvestris by its larger leaves and cones (both over 5 cm long). Pinus radiata (Monterey pine) is known to occasionally escape near tree plantations where the species is cultivated.

Source

Flora of Oregon, volume 1, page 119
Stephen Meyers

Sibling taxa