Hartweg's pine

Pinus hartwegii is an evergreen tree reaching 20-30 m in height, with a broad, rounded crown. The bark is thick, dark grey-brown, and scaly or fissured. The leaves are needle-like, dark green, five per fascicle, 10-20 cm long and 1.2-1.5 mm wide, the persistent fascicle sheath 1.5-2 cm long. The cones are ovoid, 6-13 cm long, black or very dark purple, opening when mature in spring to 5-7 cm broad. The seeds are winged, 5-6 mm long with a 1.5-2.5 cm wing. Pollination is in late spring, with the cones maturing 20–22 months after.

Consequently, Pinus hartwegii has been studied as an evolutionary unique member on tree line ecophysiology. It is an evergreen tree reaching 20-30 m in height, with a broad, rounded crown. The bark is thick, dark grey-brown, and scaly or fissured. The leaves are needle-like, dark green, five (occasionally four) per fascicle, 10-20 cm long and 1.2-1.5 mm wide, the persistent fascicle sheath 1.5-2 cm long. More

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