Penstemon marcusii

Penstemon marcusii
	In Emery County, Utah, past peak bloom
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Lamiales
Family:	Plantaginaceae
Genus:	Penstemon
Species:	P. marcusii
Binomial name
	Penstemon marcusii; (D.D.Keck) N.H.Holmgren
Synonyms
	Penstemon moffatii subsp. marcusii D.D.Keck ; Penstemon pseudohumilis M.E.Jones ;

Penstemon marcusii is a species of plant in the genus Penstemon. Its common name is Marcus Jones' penstemon or Marcus' penstemon. It grows only in the Navajo Basin of Carbon and Emery Counties in Utah, often in Mancos Shale.

This plant grows to about 8 inches tall with blue to violet flowers over a basal mat of spoon-shaped leaves. Its most diagnostic characteristics are the anthers and pistil, which are included deeply in the corolla. Unusual among other penstemon, Marcus' Penstemon may have evolved towards Lepidopteran pollination.

References

↑ "Penstemon marcusii (D.D.Keck) N.H.Holmgren". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 28 October 2026.
↑ Welsh, Stanley L; Atwood, N. Duane; Goodrich, Sherel; Higgins, Larry C (2015). A Utah Flora (5th ed.). Provo, Utah: Monte L. Bean Life Science Museum, Brigham Young University. p. 686. ISBN 978-0-8425-2701-9.
1 2 Stevens, Mikel R.; Love, Stephen L.; McCammon, Tony (2020). Heart of Penstemon Country: A Natural History of Penstemons in the Utah Region. Farcountry Press. pp. 196–198. ISBN 978-1-59152-261-4.
↑ Wilson, Paul; Wolfe, Andrea D.; Armbruster, W. Scott; Thomson, James D. (January 2007). "Constrained lability in floral evolution: counting convergent origins of hummingbird pollination in Penstemon and Keckiella". New Phytologist. 176 (4): 883–890. doi:10.1111/j.1469-8137.2007.02219.x. ISSN 0028-646X. PMID 17897322.

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[POWO-1] "Penstemon marcusii (D.D.Keck) N.H.Holmgren". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 28 October 2026.

[2] Welsh, Stanley L; Atwood, N. Duane; Goodrich, Sherel; Higgins, Larry C (2015). A Utah Flora (5th ed.). Provo, Utah: Monte L. Bean Life Science Museum, Brigham Young University. p. 686. ISBN 978-0-8425-2701-9.

[Stevens1-3] 1 2 Stevens, Mikel R.; Love, Stephen L.; McCammon, Tony (2020). Heart of Penstemon Country: A Natural History of Penstemons in the Utah Region. Farcountry Press. pp. 196–198. ISBN 978-1-59152-261-4.

[4] Wilson, Paul; Wolfe, Andrea D.; Armbruster, W. Scott; Thomson, James D. (January 2007). "Constrained lability in floral evolution: counting convergent origins of hummingbird pollination in Penstemon and Keckiella". New Phytologist. 176 (4): 883–890. doi:10.1111/j.1469-8137.2007.02219.x. ISSN 0028-646X. PMID 17897322.