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Pinus durangensis is an evergreen tree reaching 25–40 metres ... The seeds are winged, 5–6 mm long with a 1.5-2.5 cm wing. Pollination is in late spring, with the ...
These two characters readily distinguish the major groups of pines (see Pinus classification). Pinus durangensis (Durango pine) has fascicles of 6 needles, rarely 7, and is the only species in Pinus with so many needles per fascicle. At the other extreme, Pinus monophylla has fascicles of one needle, rarely two.
The species vary with location and conditions. Arizona pine (Pinus arizonica), Apache pine (Pinus engelmannii), and Chihuahua pine (Pinus leiophylla var. chihuahuana) are common in the northern and central portions of the range. Pinus durangensis and Pinus teocote are found from the Sierra of central Chihuahua to the southern end of the range.
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Its leaves are needle-shaped, evergreen, in fascicles of two, needle-like, straight or slightly twisted, stiff, sharp-pointed, light yellowish-green, spread apart; edges toothed and 2–4 cm (3 ⁄ 4 – 1 + 1 ⁄ 2 in) long. The bundle-sheath is persistent. The buds are blunt pointed, up to 15 mm long, reddish-brown, and resinous.
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. The needles are finely serrated, [5] and 5
Pinus, the pines, is a genus of approximately 111 extant tree and shrub species. The genus is currently split into two subgenera: subgenus Pinus (hard pines), and subgenus Strobus (soft pines). Each of the subgenera have been further divided into sections based on chloroplast DNA sequencing [1] and whole plastid genomic analysis. [2]
The leaves (needles) are in fascicles of 4–5, moderately stout, 2.5–5.5 cm (1– 2 + 1 ⁄ 8 in) long; glossy dark green with no stomata on the outer face, and a dense bright white band of stomata on the inner surfaces. The Parry pinyon begins to grow cones at around 10 to 20 years, and seed production is maximized at 50 or more years of age.