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Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Campanulids
Ordo: Asterales

Familia: Asteraceae
Subfamilia: Asteroideae
Tribus: Heliantheae
Subtribus: Engelmanniinae
Genus: Wyethia
Species: Wyethia longicaulis

Wyethia longicaulis A.Gray, Proc. Amer. Acad. Arts xix. 4 1883.
Native distribution areas:

Continental: Northern America
Regional: Southwestern USA
USA (California)

References: Brummitt, R.K. 2001. TDWG – World Geographical Scheme for Recording Plant Distributions, 2nd Edition

A.Gray, Proceedings of the American Academy of Arts and Sciences. Boston, MA 19:4. 1883


International Plant Names Index. 2018. Wyethia longicaulis. Published online. Accessed: Feb. 07 2018.
The Plant List 2013. Wyethia longicaulis in The Plant List Version 1.1. Published on the internet. Accessed: 2018 Feb. 07. 2018. Wyethia longicaulis. Missouri Botanical Garden. Published on the internet. Accessed: 2018 Feb. 07.
Hassler, M. 2018. Wyethia longicaulis. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2018. Species 2000 & ITIS Catalogue of Life. Published on the internet. Accessed: 2018 Feb. 07. Reference page.
USDA, ARS, Germplasm Resources Information Network. Wyethia longicaulis in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 07-Oct-06.

Vernacular names
English: Humboldt mule-ears

Wyethia longicaulis is a species of flowering plant in the aster family known by the common name Humboldt mule's ears. It is endemic to California, where it occurs in the North Coast Ranges and the Klamath Mountains. It grows in mountain and foothill habitat such as grassland and forests. It is a perennial herb growing from a tough taproot and caudex unit and producing a stem up to half a meter tall. It is hairless to hairy and glandular. The leaves have lance-shaped or oblong blades up to 20 centimeters long. They are glandular and have a waxy exudate that dries white. The inflorescence is usually a cluster of 2 to 4 flower heads, each with up to 10 yellow ray florets which may be up to 3 centimeters long. The fruit is an achene about a centimeter long, including its tiny pappus.

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