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The leaves are in fascicles of three, [6] needle-like, yellow-green, twisted, and 9–15 centimeters (3 + 1 ⁄ 2 –6 in) long. The cones are resin-sealed and irregularly shaped, [4] 8–16 cm (3 + 1 ⁄ 4 – 6 + 1 ⁄ 4 in) long and clustered in whorls of three to six on the branches. The scales end in a short stout prickle.
Pinus albicaulis leaves are in fascicles (bundles) of five, and the cone is dark purple when immature (Mount Rainier National Park). Whitebark pine is a member of the white pine group, the Pinus subgenus Strobus, and the section Strobus; like all members of this group, the leaves (needles) are in fascicles (bundles) of five [5] with a deciduous sheath.
There is much space between the branches. The leaf color is said to be generally gray-yellow-green. The cones are generally smaller than 13.5 cm (5.3 in) in width. The sharp tips at the end of the scales are generally less than 6 mm (0.24 in) in length. The seed is generally less than 11 mm (0.43 in) wide, and light to dark brown in color. [15]
P. radiata is a coniferous evergreen tree growing to 15–30 m (50–100 ft) tall in the wild, but up to 60 m (200 ft) in cultivation in optimum conditions, with upward pointing branches and a rounded top. The leaves ("needles") are bright green, in clusters of three (two in var. binata), slender, 8–15 cm (3–6 in) long and with a blunt tip.
The cones thus grow over a two-year (26-month) cycle, so that newer green and older, seed-bearing or open brown cones are on the tree at the same time. Open cone with empty pine nuts. The seed cones open to 6–9 cm (2 + 1 ⁄ 4 – 3 + 1 ⁄ 2 in) broad when mature, holding the seeds on the scales after opening.
Pitch pine is rapid-growing when young, gaining around one foot of height per year under optimal conditions, until growth slows at 50–60 years. By 90 years of age, the amount of annual height gain is minimal. Open-growth trees begin bearing cones in as little as three years, with shade-inhabiting pines taking a few years longer.
Western white pine is a large tree, regularly growing to 30–50 metres (98–164 ft) tall. It is a member of the white pine group, Pinus subgenus Strobus , and like all members of that group, the leaves ('needles') are in fascicles (bundles) of five, [ 5 ] with a deciduous sheath.
In order for reproduction to occur, Pinus serotina needs fire in the form of intense scorching or defoliation. The buds are dormant and protected by the tree's thick bark. When parts of the tree are top killed by fire, epicortical buds can resume growth. 15 to 20 seed trees are needed per hectare (6 to 8 acres) for the sufficient seed set after ...