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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: Astereae
Subtribus: Machaerantherinae
Genus: Xylorhiza
Species: X. cognata – X. confertifolia – X. cronquistii – X. frutescens – X. glabriuscula – X. linearifolia – X. orcuttii – X. tortifolia – X. venusta – X. wrightii

Xylorhiza Nutt.

Xylorhiza Salisb. (1866) = Allium


Nuttall, T. 1840. Descriptions of new species and genera of plants in the natural order of the Compositae, collected in a tour across the continent to the Pacific, a residence in Oregon, and a visit to the Sandwich Islands and upper California, during the years 1834 and 1835. Transactions of the American Philosophical Society, held at Philadelphia, for promoting useful knowledge, n.s.[new series][ser. 2], 7: 283–453. BHL Reference page.


International Plant Names Index. 2017. Xylorhiza. Published online. Accessed: Dec. 18 2017.
The Plant List 2013. Xylorhiza in The Plant List Version 1.1. Published on the internet. Accessed: 2017 Dec. 18. 2017. Xylorhiza. Missouri Botanical Garden. Published on the internet. Accessed: 2017 Dec. 18.
Hassler, M. 2017. Xylorhiza. 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. 2017. Species 2000 & ITIS Catalogue of Life. Published on the internet. Accessed: 2017 Dec 18. Reference page.

Vernacular names
English: Woodyaster

Xylorhiza is a genus of flowering plants in the sunflower family, are known as woodyasters.[2][3] These are daisylike wildflowers usually having blue to purple or white ray flowers with yellow centers of disc florets. Woodyasters are native to western North America.[4]


Xylorhiza cognata - Mecca woodyaster - California (Imperial + Riverside Counties)
Xylorhiza confertifolia - Henrieville woodyaster - Utah (Kane, Wayne, + Garfield Counties)
Xylorhiza cronquistii - Cronquist's woodyaster - Utah (Kane + Garfield Counties)
Xylorhiza frutescens - Baja California
Xylorhiza glabriuscula - smooth woodyaster - Wyoming, Utah (Daggett County), Colorado (Routt + Moffat Counties), Montana (Carbon County), South Dakota (Harding, Butte, Fall River Counties)
Xylorhiza orcuttii - Orcutt's aster - California (Imperial + San Diego Counties)
Xylorhiza tortifolia - Mojave woodyaster - California, Nevada, Utah, Arizona
Xylorhiza venusta - charming woodyaster - Utah, Colorado, New Mexico (Colfax County)
Xylorhiza wrightii - Big Bend woodyaster - western Texas, Chihuahua


Flann, C (ed) 2009+ Global Compositae Checklist [permanent dead link]
Nuttall, Thomas. 1840. Transactions of the American Philosophical Society, new series 7: 297–298 in English
Tropicos, Xylorhiza Nutt.
Flora of North America Vol. 20 Page 406
Biota of North America Program 2013 county distribution maps

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