Post 00158
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Pinus attenuata is a small, slender, arrowy tree, with pale green leaves in threes, clustered flowers half an inch long, brownish yellow and crimson, and cones whorled in conspicuous clusters around the branches and also around the trunk. The cones never fall off or open until the tree dies. They are about four inches long, exceedingly strong and solid, and varnished with hard resin forming a waterproof and almost worm and squirrel proof package, in which the seeds are kept fresh and safe during the lifetime of the tree. Sometimes one of the trunk cones is overgrown and imbedded in the heart wood like a knot, but nearly all are pushed out and kept on the surface by the pressure of the successive layers of wood against the base.
This admirable little tree grows on brushy, sun-beaten slopes, which from their position and the inflammable character of the vegetation are most frequently fire-swept. These grounds it is able to hold against all comers, however big and strong, by saving its seeds until death, when all it has produced are scattered over the bare cleared ground, and a new generation quickly springs out of the ashes. Thus the curious fact that all the trees of extensive groves and belts are of the same age is accounted for, and their slender habit; for the lavish abundance of seed sown at the same time makes a crowded growth, and the seedlings with an even start rush up in a hurried race for light and life.
Only a few of the attenuata and Sabiniana pines are within the boundaries of the park, the former on the side of the Merced Cañon, the latter on the walls of Hetch-Hetchy Valley and in the cañon below it.