Penstemon grahamii
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A flowering Penstemon grahamii from Utah |
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Penstemon grahamii is a species of beard thread ( Penstemon ) within the plantain family (Plantaginaceae). This endemic thrives only in the US states of Utah and Colorado .
description
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Vegetative characteristics
Penstemon grahamii is a perennial herbaceous plant that reaches heights of growth of up to 20 centimeters. It has several stems . The dark green or grayish leaves are thick and leathery.
Generative characteristics
The flowering period is between May and June. The hermaphrodite flowers are zygomorphic with a double flower envelope . The petals are tubular and are fused between 3 and 4 centimeters long corolla tube. The color of the corolla is pink with reddish sap marks . Yellow staminodes protrude from the opening of the flower tube.
Occurrence and endangerment
Penstemon grahamii thrives exclusively on the calcareous shale in northeastern Utah and in the opposite Rio Blanco County in Colorado. Since this area contains a lot of oil shale (a valuable petroleum source), this plant species is increasingly being deprived of its habitat through oil extraction . For a few years now, Penstemon grahamii has had the status "Endangered".
Common names
Common English names for Penstemon grahamii are Graham's beardtongue and Uinta Basin beardtongue.
Web links
Individual evidence
- ↑ a b Penstemon grahamii . The Nature Conservancy.
- ↑ BLM prevents listing of an endangered plant, promotes oil shale development in its habitat. Union of Concerned Scientists July 10, 2009. Accessed March 26, 2012.