The [Eastern Hemlock] is the official State Tree of the Commonwealth of Pennsylvania.
EASTERN WHITE PINE
(Pinus strobus)
Leaves: [Evergreen] needles in clusters of 5, soft, flexible, 3-sided, 2½″-5″ long, bluish green in appearance due to whitish lines. This is the only 5-needle pine native to Pennsylvania.
Twigs: Slender, flexible, with rusty hairs when young, finally smooth. Buds egg-shaped, usually less than ½″ long; gray-brown.
Fruit: A cone, 5″-8″ long, about 1″ thick, no prickles, [stalked], drooping, slightly curved, resinous, remains attached for one to several months after ripening in autumn of second season. Each scale usually bears 2 winged seeds which is characteristic of all native pines.
General: Bark on young trees and branches greenish brown and smooth, later darker, grooved and scaly. Produces one [whorl] of about 3 to 7 side branches each year, a feature which is useful in estimating age. A large and very important timber tree. Wood probably has more uses than that of any other species.
PITCH PINE
(Pinus rigida)
Leaves: [Evergreen] needles in clusters of 3, stiff, 2½″-5″ long, yellowish green.