Jeffrey pine

(Pinus jeffreyi)



Pinus jeffreyi, also known as Jeffrey pine, Jeffrey's pine, yellow pine and black pine, is a North American pine tree. It is mainly found in California, but also in the westernmost part of Nevada, southwestern Oregon, and northern Baja California. It is named in honor of its botanist documenter John Jeffrey. Pinus jeffreyi is a large coniferous evergreen tree, reaching 25 to 40 meters (82 to 131 ft) tall, rarely up to 53 m (174 ft) tall, though smaller when growing at or near tree line. The leaves are needle-like, in bundles of three, stout, glaucous gray-green, 12 to 23 centimeters (4+3⁄4 to 9 in) long. The cones are 12 to 25 cm (4+3⁄4 to 9+3⁄4 in) long, dark purple when immature, ripening pale brown, with thinly woody scales bearing a short, sharp inward-pointing barb. The seeds are 10 to 12 millimeters (3⁄8 to 1⁄2 in) long, with a large (15 to 25 mm (5⁄8 to 1 in)) wing. Pinus jeffreyi is closely related to Pinus ponderosa (ponderosa pine) and is similar in appearance. One way to distinguish between them is by their cones. Each has barbs at the end of the scales. The sharp Pinus jeffreyi cone scale barbs point inward, so the cone feels smooth to the palm of one's hand when rubbed down the cone. Pinus ponderosa cone scale barbs point outward, so feel sharp and prickly to the palm of one's hands. The memory device of 'gentle Jeffrey' and 'prickly ponderosa' can be used to differentiate between the species. Another distinguishing characteristic is that the needles of Pinus jeffreyi are glaucous, less bright green than those of Pinus ponderosa, and by the stouter, heavier cones with larger seeds and inward-pointing barbs. Pinus jeffreyi can be somewhat distinguished from Pinus ponderosa by the relatively smaller scales of reddish-brown bark as compared to the larger plates of orangish ponderosa bark.

Taxonomic tree:

Kingdom: Plantae
Phylum: Coniferophyta
Class: Pinopsida
News coming your way
The biggest news about our planet delivered to you each day