Pinus monophylla |
Pinus |
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singleleaf pine |
pine |
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Habit | Trees evergreen; mature crowns conic to irregular. | |
Bark | smooth when young, becoming fissured with age; branches whorled, ascending to descending; twigs generally resinous. |
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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. |
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Pollen cones | in clusters. |
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Seed cones | maturing in 2(3) years, pendent to erect, conic to cylindric; scales persistent; bracts included. |
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Pinus monophylla |
Pinus |
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Distribution | ||
Discussion | [This taxon does not have a floristic treatment in Flora of Oregon.] |
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 | Flora of Oregon, volume 1, page 119 Stephen Meyers |
Sibling taxa | ||
Subordinate taxa | ||
Web links |
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