If there are 2, 3 or 5 needles attached in a fascicle (bundle) on the stem, it is Pinus. On 2 and 3- needle pines, the fascicle is held in place with a thin membranous sheath called a fascicle sheath or bundle sheath. On 5-needle pines the fascicle sheath is quickly deciduous and will not be present.
Karren Wcisel, TreeTopics.com
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Pinaceae, tree, conifer, cone, needle, evergreen, Pinus, pine, Picea, spruce, Abies, fir