Bark: Flakes off in shapes like jigsaw puzzle pieces. Older trees have a distinct yellow or orange color (not red like Jeffrey pine). Distribution: Occurs in the Pacific Coast mountain ranges, throughout the Rocky Mountains, and into northern Mexico.
http://oregonstate.edu/trees/conifer_genera/spp/pine_spp.html
Pines have four types of leaf 1  : Seed leaves (cotyledons) on seedlings, born in a whorl of 4–24. 2  Juvenile leaves, which follow immediately on seedlings and young plants, 2–6 cm long, single, green or often blue-green, and arranged spirally on the shoot. 3  These are produced for six months to five years, rarely longer.
https://en.wikipedia.org/wiki/Pine
arolla pine, cembra nut tree, Pinus cembra, Swiss pine, Swiss stone pine-large five-needled European pine; yields cembra nuts and a resinous exudate.
http://www.thefreedictionary.com/pine+tree
In the northern portion of their range, the trees grow from sea level to 2500 ft. (750 m). sugar pine (Pinus lambertiana). Needles: Occur in bundles of 5; 2-4 long; white lines on all 3 surfaces of each 3-sided needle. Fruit: Huge, woody cones, 10-20 long (larger than western white pine cones) and straight.
http://oregonstate.edu/trees/conifer_genera/spp/pine_spp.html
Pinus nigra, black pine-large two-needled timber pine of southeastern Europe. northern pitch pine, Pinus rigida, pitch pine-large three-needled pine of the eastern United States and southeastern Canada; closely related to the pond pine.
http://www.thefreedictionary.com/pine+tree
The bark of most pines is thick and scaly, but some species have thin, flaky bark. The branches are produced in regular pseudo whorls, actually a very tight spiral but appearing like a ring of branches arising from the same point.
https://en.wikipedia.org/wiki/Pine
Many pine species make attractive ornamental plantings for parks and larger gardens with a variety of dwarf cultivars being suitable for smaller spaces. Pines are also commercially grown and harvested for Christmas trees. Pine cones, the largest and most durable of all conifer cones, are craft favorites.
https://en.wikipedia.org/wiki/Pine
The modern English name pine derives from Latin pinus which some have traced to the Indo-European base *pīt- ‘resin’ (source of English pituitary). In the past (pre-19th century) they were often known as fir, from Old Norse fyrre, by way of Middle English firre.
https://en.wikipedia.org/wiki/Pine
Needles: Occur in bundles of 3 (rarely 2); 5-10 long; tufted near the ends of branches (needles are held only 2-3 years). Fruit: Egg-shaped cone; 3-5 long (much smaller than Jeffrey pine cones); each scale has a straight, stiff prickle that sticks out.
http://oregonstate.edu/trees/conifer_genera/spp/pine_spp.html
Noun. 1. pine tree-a coniferous tree. pine, true pine. genus Pinus, Pinus-type genus of the Pinaceae: large genus of true pines. pine-straight-grained durable and often resinous white to yellowish timber of any of numerous trees of the genus Pinus.
http://www.thefreedictionary.com/pine+tree
what is a pine tree
A pine is a coniferous tree. A pine tree is a coniferous tree.