Penstemon deustus

Penstemon deustus is a subshrub, a plant with a largely herbaceous character, but somewhat woody at its base.^[3] Its stems grow from a woody caudex with many branches that may be as much as 1 centimeter thick. It may also have leafy shoots that do not produce flowers.^[4] It stems range in size from 6 to 60 cm, but usually are taller than 15 cm. They may be nearly hairless, but are more often covered in small, stiff, backwards facing hairs and are never waxy.^[3] The stems may lay down on the ground, grow outwards a short distance before curving to grow upwards, or grow straight upwards.^[4]

The leaves can be hairless or covered in glandular hairs and have edges that are shallowly to deeply toothed.^[4] All the leaves are cauline, attached to the stems rather than to the base of the plant, and are not leathery. Like the stems they may be hairless or retrorsely hairy and might be attached on opposite sides of the stems, nearly opposite, or arranged in whorls. Stems will usually have five to nine pairs of leaves, attached by petioles or directly to the stem.^[3]

The inflorescence is 6 to 30 centimeters at the top of a stem and produces five to eleven groups of flowers. Each group will have a pair of bracts and two cymes, each with one to six flowers.^[3] The tubular flowers have two lips with five-lobes. The glandular flower is cream in color with dark lining and reaches 1.5 cm in length.^[5]

The scientific description and name of Penstemon deustus was first published by David Douglas in 1830. It has four varieties according to Plants of the World Online.^[2]

• Penstemon deustus var. deustus
• Penstemon deustus var. pedicellatus
• Penstemon deustus var. suffrutescens
• Penstemon deustus var. variabilis

It also has 9 synonyms of the species or one of its varieties.^[2][6][7][8]

Penstemon deustus has a range that extends over parts or most of eight western US states. It grows in much of Eastern Washington and all but the northwest corner of Oregon.^[10] It also grows in California to the north of San Francisco Bay in the North Coast Ranges into the Klamath Range and Cascades. They also may be found in the northern and central Sierra Nevada.^[11] It is very widespread in Nevada, being recorded in every county except for Lincoln County. Similarly it is found in much of Idaho. However it is only known from two southwestern counties of Montana, three western counties in Wyoming, and just Box Elder County in northwest Utah.^[10]

This species grows in dry rocky locations, very often on basalt rocks, but also sometimes on limestone.^[4]

This plant is used in wilderness revegetation and landscaping projects in its native region. It is favored for its low water needs and its abundant flowers which attract pollinators, including honey bees, bumblebees, sweat bees, and leafcutter bees.^[9]

• List of Penstemon species