Penstemon linarioides

Penstemon linarioides is a plant species in the genus Penstemon. Its common names include toadflax penstemon, toadflax beardtongue and Colorado narrowleaf beardtongue. It grows in Nevada, Arizona, Utah, Colorado, and New Mexico.

Taxonomy Penstemon linarioides was scientifically described in 1859 by Asa Gray. He placed the species in the genus Penstemon which is part of the Plantaginaceae family. It has four accepted varieties.

Penstemon linarioides var. coloradoensis – Arizona, Colorado, and New Mexico Penstemon linarioides var. linarioides – Baja California, Arizona, New Mexico, and Sonora Penstemon linarioides var. maguirei – Arizona and New Mexico Penstemon linarioides var. sileri – Arizona, Nevada, and Utah

It has eight synonyms of the species or one of its four varieties.

Table of Synonyms Name Year Rank Synonym of: Notes Penstemon coloradoensis 1899 species var. coloradoensis ≡ hom. Penstemon coloradoensis subsp. sileri 1920 subspecies var. coloradoensis = het. Penstemon linarioides subsp. coloradoensis 1937 subspecies var. coloradoensis ≡ hom. Penstemon linarioides subsp. compactifolius 1937 subspecies var. linarioides = het. Penstemon linarioides subsp. maguirei 1937 subspecies var. maguirei ≡ hom. Penstemon linarioides subsp. sileri 1937 subspecies var. sileri ≡ hom. Penstemon linarioides subsp. typicus 1937 subspecies P. linarioides ≡ hom., not validly publ. Penstemon linarioides var. viridis 1937 variety var. sileri = het. Notes: ≡ homotypic synonym; = heterotypic synonym

Names The species name, linarioides, means 'like toadflax' in Botanical Latin due to the similar leaf shape to some species in the genus Linaria. Penstemon linarioides is known by the common names toadflax penstemon, linarialeaf penstemon, and narrowleaf penstemon. It is also known as Colorado toadflax beardtongue and toadflax beardtongue. It is sometimes called mat penstemon, however Penstemon caespitosus is more typically known by this name.

Penstemon linarioides

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