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   Genetic research in the 1990s and early 2000s showed that the Penstemon genus belongs in Plantaginaceae (Plantain Family), not Scrophulariaceae (Snapdragon Family).

    In North America there are over 250 Penstemon species, which ties it with Eriogonum for third most numerous. Carex has 480 and Astragalus 350 species.

    There are more than 36 Penstemons found in the Four Corners area, only surpassed by the Astragalus genus with 61.

     The Penstemon genus has 19 species on this web site. Eriogonum has 14. Astragalus has 31 species and Erigeron 27.

     Penstemons are so attractive and popular that there is an American Penstemon Society.   

      In 1748 the Penstemon genus was named by British citizen and 1735-1746 American resident and plant collector, Dr. John Mitchell.  

    Almost all botanical sources  indicate that the word "Penstemon" is derived from the Greek "pente" ("five") and "stemon" ("thread").  Penstemons are so named because one of their five stamens, i.e., one of their thread-like structures, is sterile and visually distinctly different from the others. 

     An alternate, but ultimately similar etymology is given by Intermountain Flora: "paene" is Latin for "nearly" and "stemon" is Greek for "thread".  Thus the name means "nearly a thread", i.e., nearly a stamen.

     Whatever the derivation, the botanical word for a sterile stamen is "staminode", a modified stamen which does not produce pollen.   You can see this staminode, nearly a stamen, structure at the left in the above photograph.  Notice that the staminode has a few hairs at its tip;  some Penstemon staminodes are very hairy and most project outward toward the end of the lower lip of the floral tube.  These two characteristics are the source for one common name for the genus, "Beard Tongue".

Penstemon barbatus

Penstemon barbatus

Penstemon barbatus subspecies torreyi (Scarlet Bugler, Scarlet Penstemon, Scarlet Beardtongue) 
Plantaginaceae (Plantain Family)

Semi-desert, foothills. Woodlands, openings. Spring, summer.
Above and left: Mesa Verde National Park, July 21, 2004.

Penstemon barbatus is very common throughout the lower elevations of the Four Corners area, and it is abundant in Mesa Verde National Park. This is a very tall and lanky Penstemon, often growing to four or five feet with an abundance of flowers opening over many weeks. Stem leaves are long, narrow, and widely spaced.

For a very similar species that is also abundant in the Four Corners, see Penstemon rostriflorus.  Although the flowers of the two species are somewhat similar, the forms are quite different: P. barbatus is tall, lanky, and airy whereas P. rostriflorus is much shorter and crowded. Also, P. barbatus blooms in June and July and is flexible and herbaceous throughout.  P. rostriflorus blooms from late June into October and is quite woody at its base.  And most unusual for any of our local Penstemons, P. rostriflorus is commonly evergreen.

Penstemon barbatus was named by Albrecht Roth in 1846 from a collection made in Mexico.

"Barbatus" is Latin for "hairy" or "bearded" and refers to the hairy flower throat of variety barbatus.

Penstemon barbatus
Penstemon barbatus subspecies torreyi (Scarlet Bugler, Scarlet Penstemon, Scarlet Beardtongue) 
Plantaginaceae (Plantain Family)

Semi-desert, foothills. Woodlands, openings. Spring, summer.
Canyons of the Ancients National Monument, June 6, 2005.

Penstemon barbatus subspecies trichander (Scarlet Bugler, Scarlet Penstemon, Scarlet Beardtongue) 
Plantaginaceae (Plantain Family)

Semi-desert, foothills. Woodlands, openings. Spring, summer.
Canyons of the Ancients National Monument, June 6, 2005.

Penstemon barbatus, variety trichander (Greek for "hairy anthers") is found in the Four Corners counties and in a few counties south of the Four Corners in New Mexico and Arizona.

Penstemon barbatus
Penstemon barbatus (Scarlet Bugler, Scarlet Penstemon, Scarlet Beardtongue) 
Plantaginaceae (Plantain Family)

Semi-desert, foothills. Woodlands, openings. Spring, summer.
Canyons of the Ancients National Monument, May 25, 2016.

A young Penstemon barbatus, just 18 inches tall, shows the difference in the shape of the basal and stem leaves.

 

Penstemon eatonii

Penstemon eatonii

Penstemon eatonii
 
Penstemon eatonii  (Eaton's Penstemon, Eaton's Beardtongue)
Plantaginaceae (Plantain Family)

Semi-desert, foothills. Openings, shrublands, woodlands.  Spring, summer.
Above: Canyons of the Ancients National Monument, May 11, 2016.
Left: Grandstaff Canyon, Utah, April 14, 2005.

Sprawling or upright growth patterns are common for Penstemon eatonii.  As is true for many Penstemons, flower stalks are often arched over near the tops and straighten as the stem gains strength.  The corolla lobes are very small so that at a glance the flower appears to be a very narrow long closed tube. 

The blazing red of Penstemon eatonii is very common throughout the spring and early summer from trails in Mesa Verde National Park to open expanses of Utah and Arizona.

Daniel Eaton was a nineteenth century American botanist, who collected this plant in 1869 in Utah near Provo.  Asa Gray named the plant in 1872.  (More biographical information about Eaton.)

Penstemon eatonii

Penstemon eatonii

Penstemon eatonii

Penstemon eatonii   (Eaton's Penstemon, Eaton's Beardtongue)
Plantaginaceae (Plantain Family)

Semi-desert, foothills. Openings, shrublands, woodlands. Spring, summer.
Grandstaff Canyon, Utah, April 14, 2005 and
Canyons of the Ancients National Monument, May 11, 2016.

Leaf margins are usually crisped (wavy-edged) and leaves are typically lanceolate (but may be oblanceolate or broadly obovate).

Stem leaves are cupped and clasp the stem (no petiole).

The third photograph at left shows basal leaves which are typically a bit larger than stem leaves and have a petiole.

Penstemon eatonii
Penstemon eatonii   (Eaton's Penstemon, Eaton's Beardtongue)
Plantaginaceae (Plantain Family)

Semi-desert, foothills. Openings, shrublands, woodlands. Spring, summer.
Canyons of the Ancients National Monument, May 17, 2009.

Did you ever wonder, "Where have all the flowers gone"?

Range map © John Kartesz,
Floristic Synthesis of North America

State Color Key

Species present in state and native
Species present in state and exotic
Species not present in state

County Color Key

Species present and not rare
Species present and rare
Species extirpated (historic)
Species extinct
Species noxious
Species exotic and present
Native species, but adventive in state
Eradicated
Questionable presence

Range map for Penstemon barbatus

Penstemon barbatus variety trichander

Range map for Penstemon barbatus subspecies trichander

Range map for Penstemon eatonii