. Botanical and vegetation survey of Carter County, Montana, Bureau of Land Management-administered lands . Botany; Rare plants. Penstemon angustifolius Nutt. ex Pursh NARROWLEAF PENSTEMON Figwort Family (Scrophulariaceae) CONSERVATION STATUS U. S. Fish and Wildlife Service: None Bureau of Land Management: Watch Montana Natural Heritage Program: G5 82; demonstrably secure globally, but may be imperiled in Montana where it is rare. DESCRIPTION: Narrowleaf penstemon is a perennial herb with 1 or occasionally more erect stems, 15-45 cm (6-18 in) tall, from a taproot surmounted by a branched, wood
. Botanical and vegetation survey of Carter County, Montana, Bureau of Land Management-administered lands . Botany; Rare plants. Penstemon angustifolius Nutt. ex Pursh NARROWLEAF PENSTEMON Figwort Family (Scrophulariaceae) CONSERVATION STATUS U. S. Fish and Wildlife Service: None Bureau of Land Management: Watch Montana Natural Heritage Program: G5 82; demonstrably secure globally, but may be imperiled in Montana where it is rare. DESCRIPTION: Narrowleaf penstemon is a perennial herb with 1 or occasionally more erect stems, 15-45 cm (6-18 in) tall, from a taproot surmounted by a branched, woody crown. Basal leaves, 4-9 cm (1-4 in) long, are strap or narrowly lance shaped with short petioles and entire margins. The opposite stem leaves are just as long but lack petioles. Foliage is glabrous, somewhat thickish, and often covered with a thin coat of bluish wax. The inflorescence consists of clusters of several short-stalked flowers in the axils of the reduced upper leaves. The tubular corolla is flared and 2-lipped at the mouth, 14-20 mm long, and pink to lavender or most often bright blue, and glabrous externally. The 5 narrowly lance-shaped calyx segments are 4-8 mm long, and have a narrow white margin. The 4 anthers are glabrous. Flowering in May-June. The only other species of Penstemon in southeastern Montana with a glabrous corolla are shining penstemon (P. nitidus) and large beardtongue {P. grandiflorus), but neither have linear leaves. GEOGRAPHICAL DISTRIBUTION Global distribution: Great Plains; North Dakota to Montana, south to Arizona, New Mexico, and Oklahoma (Great Plains Flora Association 1986). Montana distribution: There are now 12 records known from the state. All recent collections are from Carter County. Pre- 1950 collections were taken from Dawson and Missoula Counties; the latter is a highly disjunct occurrence at the west end of the state that is recommended for verification. Carter County distribution: Nine populations are documented from northern
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