Centennial Mountains Rock Lakes National Wildlife Refuge, state and private land, and part of a USDA Agricultural Research Station for sheep. Around 326 vascular plant species have been identified in the Centennials, an unusual plant diversity for the Yellowstone region. Grizzly bears inhabit the area, as nearly all species indigenous to the Greater Yellowstone Ecosystem are present. The north slope of the Centennials rises abruptly 3,000 feet above the Centennial Valley. Centennial Mountains The Centennial Mountains are the southernmost sub-range of the Bitterroot Range in the United States states of Idaho and Montana. The Centennial Mountains include the Western and Eastern Centennial
Sandia–Manzano Mountains of historic U.S. Route 66. The Sandia–Manzano Mountains are often considered to be the northernmost major range in the Mexican Highlands geographic province. A substantial distance gap of much lower elevation grasslands and savanna exists between the Sangre de Cristo Mountains and the Sandia Mountains, and climate conditions shift between both ranges. This distinction is further made by plant, animal, and insect species that are common in both the Sandia–Manzano Mountains and in other mountainous areas to the south, but diminish quickly in the mountains to the north. These include "Quercus turbinella", "Opuntia engelmannii", "Aloysia wrightii", and the western diamondback