Sequoia gigantea: the Sierra redwood known for its great size and stature. It is generally known as the oldest and largest of all living trees. Bark is reddish brown, thick and fire resistant. Grows on western slopes of Sierra Nevada range at elevations between 4500 and 8000 feet. There are only 26 groves remaining of these majestic giants. The General Grant tree, the largest of all the Sequoia, is measured at 271 feet tall, and at 16 feet from the ground is over 25 feet in diameter. The huge trees we see today began as seedlings over 2000 years ago.