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Penstemon retrorsus
Penstemon retrorsus, the adobe penstemon, is a rare species of penstemon only found along parts of Uncompahgre and Gunnison rivers in western Colorado. It grows on largely barren slopes of a shale deposit where not many plants are able to survive.
Only 38 populations of the species are known, all located in Delta and Montrose counties. All known populations are from one 24 km (15 mi) long area along the northern fork of the Gunnison River and the Uncompahgre River. It is found at elevations of 1,500 to 2,500 meters (4,900 to 8,200 ft).
Although it is difficult to cultivate, adobe penstemons are grown in dry rock gardens. It is propagated by seed and requires twelve weeks of cold, moist stratification for good germination.
Firleaf beardtongue · Stemless beardtongue · Sharpleaf penstemon · Los Alamos beardtongue · Alberta beardtongue · White penstemon · White River Beardtongue · Whitemargin beardtongue · Gilia beardtongue · Penstemon angelicus · Siskiyou beardtongue · Broadbeard beardtongue
Text excerpted from the Wikipedia article Penstemon retrorsus by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
