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Penstemon / ˈ p ɛ n s t ɪ m ən /, [2] the beardtongues, is a large genus of roughly 280 species of flowering plants native to North America from northern Canada to Central America. . It is the largest genus of flowering plants endemic to North Ameri
Penstemon albifluvis is a moderate sized herbaceous plant that usually grows between 15 and 45 centimeters tall, but may rarely be as short as 10 cm or as tall as 50 cm. Most often it has 5 to 20 stems that grow straight upwards or grow outwards a short distance before curving to grow upright, but occasionally it may have just one flowering stem.
These 281 species of Penstemon are considered valid by both World Flora Online (WFO) and Plants of the World Online (POWO), with the exception of Penstemon grandiflorus. [1] [2] In both POWO and WFO, it is regarded as a synonym of Penstemon bradburyi.
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 gentianoides, the gentian beardtongue or gentian-leaved penstemon, is a species of flowering plant in the plantain family Plantaginaceae.Found on volcanic mountain slopes across Mexico and Central America, especially in Mexican mountain pine forests, it is a somewhat shrubby perennial herb that can grow up to 1.5 meters tall in good conditions.
Penstemon caespitosus, commonly known as mat penstemon, is a summer blooming perennial flower in the large Penstemon genus. It is a widespread plant from near timberline to the foothills in the Southern Rocky Mountains and Colorado Plateau in North America.
Penstemon richardsonii is a perennial that is often shrubby at the base and has several slender flowering stems that are 20 to 80 cm tall. The leaves are in opposite pairs borne on the flowering stem, are sessile (no petiole) except near the base, and are sharply serrate-dentate to irregularly pinnatifid and up to 7 cm long and 3 cm wide.
Penstemon watsonii is a herbaceous plant that may grow 25 to 65 centimeters tall. Its slightly hairy or occasionally smooth stems may grow outwards a short distance and then curve to grow upwards or grow straight up from the base of the plant. The stems sprout from a caudex that branches frequently. [3]
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