Species Identification

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

AttributeThe current selection is Penstemon_hallii
ClassificationPenstemon Habroanthus Glabri
GeneralHall’s Penstemon The species’ name honors Elihu Hall (1822-1882), the Illinois botanist who collected plants from OR to TX. Blooms: Late June to August.
Anther: Purple, opening across connective, becoming almost flattened (explanate), sometimes with a few hairs at connective.
StaminodeLong exserted, densely orange-bearded most of its length
LeavesDark green basal leaves, many erect, narrow, grass-like, to 60 mm (2 1/4”) long and 1/8-1/10”, rounded slightly at tips, a few wider stem leaves, up to 40 mm long, or sometimes reduced and hidden in basal leaves.
StemsForming enormous mats about 1.6-2.0 dm (6- 8”) tall, and yards wide on the old railroad route over Boreas Pass, plus other alpine areas of Colorado.
InflorescenseShort, with 2-4 nodes, cyme 1-flowered.
Corolla15-24 mm (1/2-1”) long, bell-shaped (expanded abruptly, to a wide opening) deep blue-purple, abruptly white on lip, tube short, hidden in sepals, lobes large, lip bearded.
Flower Color
Calyx4-6 mm (<1/4”) long, with ragged sepals, sometimes sharply pointed.
HabitatAbove tree line in rocky scree and on road cuts (3200-4000m (10,000-12,300’).
RangeRocky Mts. in Colorado.