Species Identification

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

AttributeThe current selection is Penstemon_oliganthus
ClassificationPenstemon Penstemon Penstemon Humiles
GeneralMany-flowered Penstemon Four species formerly considered part of the oliganthus complex are now classified as separate species: P. griffinii, pseudoparvus, inflatus and metcalfei. P. oliganthus is a slender, delicate plant with small, scattered flowers. Blooms: June to September
AntherBlack, widely divaricate (spreading), opening moderately.
StaminodeDense, golden beard most of its length, clearly visible in mouth.
LeavesBasal rosette leaves to 65 mm (2 ) long & as wide, (sometimes with long petiole, to 13 cm (5) long & 1/7 as wide), ovate, elliptic or lanceolate with blunt or sharp tips, lower stem leaves to 35 mm (1 ) long & 1/8 as wide, lanceolate or linear, shorter than the length of the stem between the leaf nodes, reduced above, often downy and dark green.
Stems2-5 dm, (8-20) tall, slender, often sinuous, and bare-looking with leaves growing only 2/3 up the stalk.
Inflorescensebare-looking, with only 1 cluster (rarely crowded), cyme 1-3 cm long, 1-few flowered.
Corolla15-26 mm long, blue-purple or red- purple, white throat bearded with pale, golden hairs and two-ridged beneath, and white on lower part of tube, often drooping, lower lobes long projecting; corolla expanded gradually, slightly, to narrow mouth, glandular (sticky) and hairy on outside.
Flower Color
Calyx4-6 mm (to ) long, sepals broad lanceolate to lanceolate tapering to a point with papery margins.
HabitatIn pine woods, semi-shady, and mountainous.
RangeCentral CO s to c NM, e AZ.