Penstemon digitalis is a species of flowering plant in the plantain family, Plantaginaceae. The flowers are white and are borne in summer. According to Francis W. Pennell it is a native of the Mississippi basin and its occurances in Canada and the eastern United states are introductions. Because of this Penstemon digitalis is the most widespread species of Penstemon east of the Mississippi River.
Penstemon albomarginatus is a rare species of penstemon known by the common name white-margined penstemon. It is native to the deserts of southern Nevada, western Arizona, and southern California.
Penstemon barnebyi is a species of penstemon known by the common names White River Valley beardtongue and Barneby's beardtongue. It is native to the mountain and basin territory of central western Nevada, where it grows in sagebrush and woodland; there is also one occurrence just over the California border.
Penstemon bicolor is a species of penstemon known by the common name pinto penstemon. It is native to the desert mountains and valleys of southern Nevada, eastern California, and western Arizona, where it grows in scrub, woodland, and other local habitat. It is a perennial herb which may exceed one meter in maximum height.
Penstemon eatonii is a species of flowering plant in the genus Penstemon, known by the common name firecracker penstemon. It is native to the Western United States from Southern California to the Rocky Mountains. It grows in many types of desert, woodland, forest, and open plateau habitat.
Penstemon filiformis is an uncommon species of Penstemon known by the common name threadleaf penstemon. It is endemic to the Klamath Mountains of northern California, where it grows in forest and woodland, often on serpentine soils.
Penstemon grandiflorus, known by the common names shell-leaved penstemon, shell-leaf beardtongue, or large-flowered penstemon, is a tall and showy plant in the Penstemon genus from the plains of North America. Due to its large flowers it has found a place in gardens, particularly ones aimed at low water usage like xeriscape gardens.
Penstemon canescens is a species of penstemon in the family Plantaginaceae. P. canescens is known by the common names gray beardtongue or Appalachian beardtongue. It is native to woodlands, forest edges, and roadsides of the southeastern United States and flowers May through July. It is a perennial herb producing stems reaching 80 centimeters in maximum height.
Penstemon cyaneus is a species of flowering plant in the plantain family known by the common names blue penstemon and dark blue penstemon. It is native to the western United States, where it is widespread in Idaho and also found in parts of Montana and Wyoming.
Penstemon comarrhenus is a perennial plant in the plantain family (Plantaginaceae) found in the Colorado Plateau and Canyonlands region of the southwestern United States.
Penstemon cyanocaulis, the bluestem penstemon or bluestem beardtongue, is a perennial plant in the plantain family (Plantaginaceae) found in the Colorado Plateau and Canyonlands region of the southwestern United States.
Penstemon cobaea is a flowering plant in the plantain family, commonly known as Cobaea beardtongue, prairie penstemon or foxglove penstemon. The plant is native to the central United States, primarily the Great Plains from Nebraska to Texas, with additional populations in the Ozarks of Missouri and Arkansas. There are also populations reported in the southwestern United States as well as in Illinois and Ohio, but these appear to be introductions.
Penstemon brevisepalus, commonly known as short-sepaled beardtongue, is an herbaceous plant in the plantain family. It is a perennial that produces pale lavender flowers in late spring.
Penstemon arkansanus is a species of flowering plant in the plantain family known by the common name Arkansas beardtongue. It is endemic to Texas, Arkansas, Oklahoma, Missouri, and Illinois in the United States, occurring in rocky or sandy soils of shale or sandstone.
Penstemon australis is a perennial plant native to the southeastern United States, with the common name Eustis Lake penstemon.
Penstemon whippleanus, commonly known as dusky penstemon, dusky beardtongue, Whipple's penstemon, or Whipple's beardtongue, is a summer blooming perennial flower in the large Penstemon genus. It is a widespread plant within the hemiboreal forests of the Rocky Mountains in North America. It is noted for the large deep purple-red flowers and a preference for high mountain elevations.
Penstemon virens, commonly known as blue mist penstemon, Front Range penstemon, or Green beardtongue, is a common Penstemon in the Front Range foothills in Colorado and Wyoming. The dainty flowers are an ornament to many rocky or sandy area within its range. It is confusingly similar to Penstemon humilis and Penstemon albertinus though the ranges of these plants do not overlap in the wild. The origin of calling it the "blue mist penstemon" is not precisely known, but is thought to relate to the large number of blue flowers the plant can produce reminding observers of a blue mist.
Penstemon albidus, commonly known as white penstemon, white-flower beardtongue, or Red-Line Beardtongue is a very widespread perennial flower of the mixed-grass and shortgrass prairies. Its natural distribution is from Manitoba and Alberta in Canada to Texas and New Mexico in the United States. The bright white flowers for which they are named are quite attractive to both bees and hummingbird moths.
Penstemon auriberbis, commonly known as the Colorado penstemon or Colorado beardtongue, is a species of Penstemon that grows in the shortgrass prairies of southern Colorado and in a few places in northern New Mexico. Although specimens were collected on the 1820 expedition by Stephen H. Long through the area, they were not scientifically described as a separate species until 1920.
Penstemon ophianthus, the coiled anther penstemon, is a species of small perennial plant in the plantain family. It has very noticeable dark violet lines on its flowers over a lighter blue-lavender color. The species grows in the plateaus and canyon lands of western Colorado and New Mexico, northern Arizona, and southern Utah.
