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Genus Pinus Family Pinaceae

Description: Trees with regularly whorled branches; monoecious.

Shoots of 2 kinds, the long shoots bearing scale leaves without chlorophyll and with woody, decurrent bases, the short shoots borne in the axils of the scale leaves and consisting of a definite number of green, needle-like leaves surrounded by persistent sheathing scale leaves at the base, the shoot finally falling off as a unit.

Male cones replace short shoots at base of a new year's growth; sporophylls each producing 2 microsporangia on the lower surface. Female cones replace long shoots and usually ripen in the second year, the cone scales thin or woody; seeds 2 to each scale, usually winged.


Distribution and occurrence: World: c. 100 species, Northern Hemisphere. Australia: c. 11 species (naturalized), Qld, N.S.W., Vic., Tas., S.A., W.A.

Many species are cultivated as ornamental and timber trees in cooler parts of the world, a number have become naturalized in N.S.W.

Text by G. J. Harden
Taxon concept:

Taxa not yet included in identification key
Pinus halepensis,    Pinus mugo,    Pinus patula,    Pinus pinea,    Pinus ponderosa

 Key to the species 
1Leaves thin and flexible, mostly in groups of 3 (sometimes 2 or 4) on short shoots2
Leaves stout and rigid, always in pairs, on short shoots4
2Leaves usually <15 cm long; cones ± asymmetricalPinus radiata
Leaves mostly >15 cm long; cones symmetrical
                       Back to 1
3
3Leaves always in groups of 3; cones sessilePinus taeda
Leaves in groups of 2–4; cones shortly stalked
                       Back to 2
Pinus elliottii
4Buds non resinous; leaves mostly 15–24 cm longPinus pinaster
Buds strongly resinous; leaves mostly 3–7 cm long
                       Back to 1
Pinus contorta

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