Species Identification

Interested in the identification of penstemons? Please select a species then click on submit:

AttributeThe current selection is Penstemon_euglaucus
ClassificationPenstemon Penstemon Penstemon Proceri
GeneralEnglish Glaucous Penstemon This one is very similar to P. rydbergii except that the foliage is smooth and very glaucous (bluish) throughout. Euglaucus indicates very blue-glaucous or somewhat waxy leaves. It grows on extremely well drained, rocky slopes in full sun (or doesn’t maintain the blue appearance.) Blooms: July and August.
Anther0.5-0.7 mm long, the sacs boat-shaped, opening totally or just not quite complete (reportedly) spreading nearly opposite.
StaminodeUsually just reaching the orifice, bearded with short yellow hairs.
Leaves2.4-10 cm (1-4”) long, glaucous, glabrous and entire, the basal leaves elliptic and abundant, tapering to slender stems at base; cauline leaves oblanceolate and small near the base, narrow elliptic to linear above, stemless, the nodes typically few and widely spaced above.
Stems1.5-6 dm) 6-24”) tall, usually several slender, somewhat lax stems in a mat with some short, sterile, leafy stems at the base, smooth.
InflorescenseOf 2 to 4 few flowered verticillasters, well separated, the cymes mostly 2- to 4-flowered, the lowermost on stems 2-2.5 cm (to 1”) long, held tightly to the stem.
Corolla11-55 mm (7/16-5/8”) long, dark blue to lavender white in the throat, the tube moderately inflated, the lips reflexed, the palate 2-ridged and lightly bearded on the ridges.
Flower Color
Calyx3.5-5 mm long, the sepals oval and tapered abruptly to sharp narrow tips, broadly thinned and ragged.
HabitatDry sandy volcano ash soils, open or sparsely wooded slopes from moderate to high elevations.
RangeEast side Cascades from s WA to c OR