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Montana Field Guides

Two-leaf Beardtongue - Penstemon diphyllus

Native Species

Global Rank: G4
State Rank: S4
(see State Rank Reason below)

Agency Status
MNPS Threat Rank:

External Links

State Rank Reason (see State Rank above)
Numerous collections at MONTU from Ravalli, Teton, Granite, SilverBow, Missoula, Sanders, Mineral and Jefferson Counties. Not rare.

Often grows on cliffs and other very rocky sites that are probably secure from degradations.

A regional endemic of SE Washington (one population) plus eastcentral Idaho and western Montana. Part of a small, morphologically very distinct section.
General Description
Stems sterile and fertile, mat-forming, prostrate and woody at the base, ascending distally, 5-15 cm. Herbage glabrous, puberulent on the stems. Leaves all cauline, serrate; those of sterile stem petiolate, blades elliptic,1–3 cm long; those of fertile stems sessile, elliptic to obovate, serrate. Inflorescence a few-flowered, glandular-pubescent raceme. Flowers: calyx 8–15 mm long; sepals linear to lanceolate, 7–9 mm long; corolla light lavender, 25–35 mm long, glabrous; anthers wooly-villous, opening across their full length. Capsule 8–11 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
BC, AB, ID and MT (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 10

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Rock outcrops, moraine, exposed slopes; subalpine, alpine (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

  • Additional ReferencesLegend:   View Online Publication
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    • Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Strickler, D. 1997. Northwest penstemons. Flower Press, Columbia Falls, Montana. 191 pages.
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Citation for data on this website:
Two-leaf Beardtongue — Penstemon diphyllus.  Montana Field Guide.  .  Retrieved on , from