George Engelmann

The blue spruce (Picea pungens), also commonly known as Colorado spruce or Colorado blue spruce, is a species of spruce tree native to North America in Arizona, Colorado, Idaho, New Mexico, Utah and Wyoming. It is noted for its often strongly glaucous blue-green needles, and has therefore been used as an ornamental tree in many places far beyond its native range.

Yucca brevifolia (also known as the Joshua tree, yucca palm, tree yucca, and palm tree yucca) is a plant species belonging to the genus Yucca. It is tree-like in appearance, which is reflected in its common names. This monocotyledonous tree is native to the arid Southwestern United States (specifically California, Arizona, Utah, and Nevada), and northwestern Mexico. It is confined mostly to the Mojave Desert between 400 and 1,800 m (1,300 and 5,900 ft) elevation. It thrives in the open grasslands of Queen Valley and Lost Horse Valley in Joshua Tree National Park. Other regions with a large

Pinus aristata, the Rocky Mountain bristlecone pine or Colorado bristlecone pine is a long-lived species of bristlecone pine tree native to the United States. It is found in the Rocky Mountains in Colorado and northern New Mexico, with an isolated population in the San Francisco Peaks of Arizona. It is found at very high altitudes, from 2,100 to 4,000 meters (6,900 to 13,100 ft) in cold, dry subalpine climate conditions, often at the tree line, although it also forms extensive closed-canopy stands at somewhat lower elevations.

Pinus elliottii, commonly known as slash pine, is a conifer tree native to the Southeastern United States. Slash pine is named after the "slashes" – swampy ground overgrown with trees and bushes – that constitute its habitat. Other common names include swamp pine, yellow slash pine, and southern Florida pine. Slash pine has two different varieties: P. e. var. elliottii and P. e. var. densa. Historically, slash pine has been an important economic timber for naval stores, turpentine, and resin. The wood of slash pine is known for its unusually high strength, especially for a pine. It exceeds

Pinus albicaulis, known by the common names whitebark pine, white bark pine, white pine, pitch pine, scrub pine, and creeping pine, is a conifer tree native to the mountains of the western United States and Canada, specifically subalpine areas of the Sierra Nevada, Cascade Range, Pacific Coast Ranges, Rocky Mountains, and Ruby Mountains. It shares the common name "creeping pine" with several other plants. The whitebark pine is typically the highest-elevation pine tree found in these mountain ranges and often marks the tree line. Thus, it is often found as krummholz, trees growing close to the

Picea engelmannii, with the common names Engelmann spruce, mountain spruce, and silver spruce, is a species of spruce native to western North America. It is highly prized for producing distinctive tone wood for acoustic guitars and other instruments, it is mostly a high-elevation mountain tree but also appears in watered canyons.

Echinocereus is a genus of ribbed, usually small to medium-sized, cylindrical shaped cacti, comprising about 70 species native to the southern United States and Mexico in very sunny, rocky places. Usually the flowers are large and the fruit edible. The name comes from the Ancient Greek ἐχῖνος (echinos), meaning "sea urchin", and the Latin cereus meaning "candle". They are sometimes known as hedgehog cacti, a term also used for the Pediocactus and Echinopsis.

Pinus edulis, the pinyon pine, Colorado pinyon, or simply pinyon (US: /ˈpɪnjən/ PIN-yuhn, UK: /piːˈnjɒn/ pee-NYON, or /pinˈjɑn/ peen-YAHN), is a species of pinyon pine from the southwestern United States noted for its large, edible seeds. Although all of the species in its section of the pine genus are called pinyon pines this is the species most associated with the name.

Pinus arizonica, commonly known as the Arizona pine, is a medium-sized pine in northern Mexico, southeast Arizona, southwest New Mexico, and western Texas in the United States. It is a tree growing to 25–35 m tall, with a trunk diameter of up to 1.2 m (3 ft 11 in). The needles are in bundles of 3, 4, or 5, with 5-needle fascicles being the most prevalent. This variability may be a sign of hybridization with the closely related ponderosa pine (Pinus ponderosa). The cones are single, paired, or in whorls of three, and 5–11 cm long.

Quercus muehlenbergii, the chinquapin (or chinkapin) oak, is a deciduous species of tree in the white oak group (Quercus sect. Quercus). The species was often called Quercus acuminata in older literature. Quercus muehlenbergii (often misspelled as muhlenbergii) is native to eastern and central North America. It ranges from Vermont to Minnesota, south to the Florida panhandle, and west to New Mexico in the United States. In Canada it is only found in southern Ontario, and in Mexico it ranges from Coahuila south to Hidalgo.

Tsuga caroliniana, the Carolina hemlock, is a species of hemlock endemic to the southern Appalachian Mountains of the United States. As of 2023, it is under review for listing under the Endangered Species Act of 1973.

Pinus strobiformis, also known as Chihuahua white pine, is a medium-sized white pine tree endemic to western Mexico in the Sierra Madre Occidental mountain range. It is typically a high-elevation pine growing mixed with other conifers in montane forest. It was formerly considered conspecific with Pinus reflexa (southwestern white pine) of the southwestern United States and Pinus stylesii of northeastern Mexico, but is now treated as distinct from these.

Hesperaloe (false yucca) is a genus of flowering plants in the family Asparagaceae, subfamily Agavoideae. It contains perennial yucca-like plants with long, narrow leaves produced in a basal rosette and flowers borne on long panicles or racemes. The species are native to the arid parts of Texas in the United States and Mexico and are sometimes cultivated as xerophytic ornamental plants. The genus name is derived from the Greek word έσπερος (hesperos), meaning "western," and aloe, which the plants resemble. The genus is not closely related to Aloe, the latter belonging to a different family

Fouquieria splendens, commonly known as ocotillo, is a plant indigenous to the Mojave, Sonoran, Chihuahuan and Colorado deserts in the Southwestern United States (southern California, southern Nevada, Arizona, New Mexico, Texas), and northern Mexico (as far south as Hidalgo and Guerrero). Ocotillos look desiccated on the outside, but they are semi-succulent; it is more closely related to the tea plant and blueberries than to cactuses. It regenerates leaves after rainfall. They can be planted as garden ornamentals.

Yucca elata is a perennial plant, with common names that include soaptree, soaptree yucca, soapweed, and palmella. It is native to southwestern North America, in the Sonoran Desert and Chihuahuan Desert in the United States (western Texas, New Mexico, Arizona), southern Nevada, southwestern Utah, and northern Mexico (Chihuahua, Coahuila, Sonora, Nuevo León). Yucca elata is widely distributed, although its population appears to be decreasing.

Quercus tomentella, the island oak, island live oak, or Channel Island oak, is an oak in the section Protobalanus. It is native to six islands: five of the Channel Islands of California and Guadalupe Island, part of Baja California. It is placed in Quercus section Protobalanus.

Opuntia engelmannii is a prickly pear common across the south-central and Southwestern United States and northern Mexico. It goes by a variety of common names, including desert prickly pear, discus prickly pear, Engelmann's prickly pear in the US, and nopal, abrojo, joconostle, and vela de coyote in Mexico. The nomenclatural history of this species is somewhat complicated due to the varieties, as well as its habit of hybridizing with Opuntia phaeacantha. It differs from O. phaeacantha by being green year round instead of turning reddish purple during winter or dry seasons, as well as having

Agave parryi, known as Parry's agave or mescal agave, is a flowering plant in the family Asparagaceae, subfamily Agavoideae. It is a slow-growing succulent perennial native to Arizona, New Mexico, and northern Mexico. The leaves are grey green and have a spine at the tip. One of the distinguishing features is that the point on the tip, which is typically dark tan, brown, or black, is darker than the leaf. Indentations of previous leaves show on the back of each leaf. The Huachuca variety grows in a rosette pattern as large as 2½ feet in diameter. Because of its compact size, plus its low

Quercus palmeri is a species of oak known by the common name Palmer oak, or Palmer's oak. It is native to California (as far north as populations just south and east of the San Francisco Bay), Baja California, Southern Nevada, and in Arizona through the transition zone to the eastern Mogollon Rim, where it grows in canyons, mountain slopes, washes, and other dry habitats.

Opuntia phaeacantha is a species of prickly pear cactus known by the common names brown-spine prickly pear, tulip prickly pear, and desert prickly pear, which is found across the southwestern United States, lower Great Plains, and northern Mexico. The plant forms dense but localized thickets. Several varieties of this particular species occur, and it may hybridize with other prickly pears, making identification sometimes tricky.

Agave palmeri (also known as Palmer's century plant) is an especially large member of the genus Agave, in the family Asparagaceae.

Agave deserti (desert agave, mescal, century plant or maguey) is an agave native to desert regions in southern California, Arizona, and Baja California. Its tall yellow flower stalks dot dry rocky slopes and washes throughout the spring. It forms a rosette of fleshy gray-green leaves 20–70 cm long and 4.5–10 cm broad, with sharp spines along the edges and at the tips. It flowers at maturity (20 to 40 years), sending up an inflorescence 2–6 m tall. The panicle bears numerous yellow, funnel-shaped flowers 3–6 cm long. There are two varieties: Agave deserti var. deserti. Plants usually with

Paleoagave is a genus of flowering plants in the family Asparagaceae. It includes a single species, Paleoagave bracteosa (synonym Agave bracteosa) which commonly known as spider agave or squid agave. It is native to the Sierra Madre Oriental of northeastern Mexico (spanning the states of Tamaulipas, Coahuila and Nuevo León), where it prefers well-drained and bright but shaded or protected locations, such as under trees or on cliffs or rocky slopes (facing away from the sun). The species can be found growing between 900 and 1700 meters elevation (from 2,950' ft. up to nearly 5,500') above sea

Yucca × schottii is a plant species in the genus Yucca, native to southern Arizona, southwestern New Mexico, and the northern parts of Sonora and Chihuahua. The common names are Schott's yucca, hoary yucca, and mountain yucca. The "×" in the name indicates that this is a nothospecies, regarded as being a natural hybrid between two other species. In this case, Yucca × schottii is believed to have originated as a hybrid between Y. baccata and Y. madrensis. Yucca × schottii is firmly established and does reproduce freely in the wild. Yucca × schottii is called mountain yucca because it is found

Opuntia basilaris, the beavertail cactus or beavertail pricklypear, is a cactus species found in the southwest United States. It occurs mostly in the Mojave, Anza-Borrego, and Colorado Deserts, as well as in the Colorado Plateau and northwest Mexico. It is also found throughout the Grand Canyon and Colorado River region as well as into southern Utah and Nevada, and in the western Arizona regions along the Lower Colorado River Valley.

Agave utahensis is a species of agave known by the common name Utah agave. Varieties of the species include the Nevada agave and Kaibab agave. It is an uncommon plant of the United States' desert southwest, in the states of Utah, Nevada, Arizona, and California. Although plants in some areas are threatened, overall the species is stable and is considered to be of Least Concern by the IUCN.

Vitis arizonica is a North American species of wild grape. It is a deciduous vine. Common names for the grape are Arizona grape, canyon grape, and uva del monte. It has historically been used as a food source by Indigenous peoples of the Southwest. Canyon grape can tolerate drought and cold temperatures. It grows in a variety of habitats including riparian zones and shady canyons. It can hybridize with mustang grape, sweet mountain grape, and California wild grape where their ranges overlap.

Opuntia chlorotica is a species of prickly pear in the family Cactaceae. Its common names include pancake prickly pear, flapjack prickly pear and dollarjoint prickly pear.

Agave shawii is a species of monocarpic succulent plant in the genus Agave, commonly known as Shaw's agave. It is a rosette-forming plant characterized by glossy, green leaves with toothed margins. After several years of slow growth, the plant puts all of its resources to produce a towering stalk of flowers, and then dies. The death of the flowering rosette is compensated by the growth of numerous clonal pups. This species is segregated into two subspecies, one native to the coast of southwestern California and northwestern Baja California, known commonly as the coast agave, and another

Rosa minutifolia is a species in the genus Rosa. It is also known by the common names Baja rose, Baja littleleaf rose, and small-leaved rose.