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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: Machaeranthera
Species: M. tagetina – M. tanacetifolia

Machaeranthera Nees

Type species: Aster tanacetifolius Kunth.


Hesperastrum A.Gray
Aster sect. Machaeranthera (Nees) Benth. & Hook. f.
Aster subgen. Machaeranthera (Nees) A. Gray


Nees von Esenbeck, C.G.D. 1833. Genera et species asterearum. Recensuit, descriptionibus et animadversionibus illustravit. Latin. Sumtibus Leonardi Schrag, Norimbergae. 334 pp. BHL Reference page.


International Plant Names Index. 2017. Machaeranthera. Published online. Accessed: Dec. 17 2017.
The Plant List 2013. Machaeranthera in The Plant List Version 1.1. Published on the internet. Accessed: 2017 Dec. 17.
Tropicos.org 2017. Machaeranthera. Missouri Botanical Garden. Published on the internet. Accessed: 2017 Dec. 17.
Hassler, M. 2017. Machaeranthera. 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 17. Reference page.

Vernacular names
English: Tansyaster
русский: Махирантера

Machaeranthera is a genus of North American flowering plants in the daisy family which are known by the common name tansyaster.[3][4]

Tansyasters are variable in appearance. Some are small, singular wildflowers, while others are sprawling shrubs. Several species easily hybridize with each other, as well, making identification difficult. In general, members of the genus may be identified by the sharp-pointed, dagger-shaped anthers in the disc florets at the center of the flower. The flower heads are usually daisylike, and are usually a shade of purple or blue, but may be pink, yellow, or white. Tansyasters are native to western North America.[4]

The genus Machaeranthera is distinguished from the genus Dieteria by having once- or twice-pinnate leaves, whereas Dieteria has entire to toothed leaves.[5]

Machaeranthera means "swordlike anthers".[6]


Machaeranthera arenaria - Baja California Sur
Machaeranthera carnosa - shrubby alkali aster - New Mexico, Arizona, California, Nevada, Sonora
Machaeranthera coulteri - California, Sonora
Machaeranthera crispa - Baja California Sur
Machaeranthera crutchfieldii - Nuevo León
Machaeranthera gracilis - slender goldenweed - California, Nevada, Utah, Colorado, Arizona, Nevada, Texas, Chihuahua
Machaeranthera grindelioides - rayless tansyaster - from Arizona to Alberta
Machaeranthera gypsophila - gypsum tansyaster - Coahuila
Machaeranthera gypsitherma - New Mexico
Machaeranthera heterophylla - Nuevo León
Machaeranthera incisifolia - northern Baja California
Machaeranthera johnstonii - Coahuila
Machaeranthera juncea - rush bristleweed - California
Machaeranthera pinnatifida - lacy tansyaster - Saskatchewan
Machaeranthera restiformis - Coahuila
Machaeranthera setigera - Mexico
Machaeranthera stenoloba - Chihuahua
Machaeranthera tagetina - mesa tansyaster - Sonora, Arizona, New Mexico
Machaeranthera tanacetifolia - tansyleaf tansyaster - from Alberta to Zacatecas
Machaeranthera tenuis - Nuevo León, Texas
Machaeranthera turneri - Chihuahua
Machaeranthera viscida - sticky tansyaster - Texas, New Mexico
Machaeranthera wigginsii - northern Baja California


Tropicos, Machaeranthera Nees
Flann, C (ed) 2009+ Global Compositae Checklist
Nees von Esenbeck, Christian Gottfried Daniel. 1832. Genera et Species Asterearum 13, 224–225
Flora of North America Vol. 20 Page 394 Machaeranthera Nees, Gen. Sp. Aster. 13, 224. 1832.
Mojave Desert Wildflowers, Pam MacKay, 2nd Ed. 2013, p. 39
Great Basin Wildflowers, Laird R. Blackwell, 2006, p. 26
Biota of North America Program 2013 county distribution maps

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Biology Encyclopedia

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