This was once believed to be but a form of P. ponderosa, but Prof. Roth-rock on Wheeler's Expedition believed it might be distinct, from its leaves being always in fives instead of in threes - as the ponderosa. Dr. Engelmann has at length decided it to be a good species, and named it as above. It grows in the Santa Rita Mountains, as low down as 7,000 feet, but it will probably be hardy enough for culture only south of the Potomac. Mr. Lemmon, who has recently given some account of it in the Rural Press, says that though the timber is as good as that of the ponderosa, the trees do hot grow as large.