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1 December 2010 Transfer of Hymenoxys argentea var. Thoreauensis to Tetraneuris (Asteraceae: Helenieae: Tetraneuridinae)
Mark W. Bierner, Billie L. Turner
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Based on evidence supporting the recognition of Tetraneuris as a genus separate from Hymenoxys, Hymenoxys argentea var. thoreauensis is basionym of a new combination, Tetraneuris argentea var. thoreauensis.

Hymenoxys argentea (A. Gray) K. F. Parker var. thoreauensis N. D. Atwood, S. L. Welsh & A. Clifford was applied by Atwood and Welsh (2007) to discoid plants growing north of Thoreau, New Mexico, “… with other mound-forming plants on a remaining lens of the windswept Todilto Limestone with limy sands and limestone gravel on the point of the Mesa above the limestone cliffs.”

Atwood and Welsh (2007) stated, “We maintain use of Hymenoxys over the segregate Tetraneuris out of personal choice and belief in a stable nomenclature.” It is their prerogative to use Hymenoxys rather than Tetraneuris. How this helps maintain a stable nomenclature is unclear to us, given that the most recent and most comprehensive treatments of the group to which these plants are referable recognize Tetraneuris as a genus separate from Hymenoxys (Bierner and Turner, 2003; Panero, 2007).

Some relatively recent workers have recognized Tetraneuris as an infrageneric grouping within Hymenoxys (e.g., Barkley, 1986; Cronquist, 1994; Karis and Ryding, 1994; Welsh, 1987). Other recent workers have recognized Tetraneuris at the generic level (e.g., Baldwin and Wessa, 2000; Baldwin et al., 2002; Bierner, 1994; Bierner and Jansen, 1998; Bierner and Turner, 2003; Spring et al., 1994). Morphological and chemical differences between taxa referable to Tetraneuris and taxa referable to Hymenoxys have been discussed at length (e.g., Bierner, 1978, 2001; Bierner et al., 1992; Díaz et al., 1992; Ferracini et al., 1994).

Atwood and Welsh (2007) cited Bierner and Turner's (2006) treatment for Flora of North America North of Mexico, but they did not cite Bierner and Turner's (2003) taxonomic treatment, which presented multiple lines of evidence for the recognition of Tetraneuris, nor did they cite Panero (2007) or Baldwin et al. (2002). The latter not only supports recognition of Tetraneuris, it corroborates Bierner (1994) and Bierner and Jansen (1998), supporting recognition of Tetraneuris.


  • Tetraneuris argentea (A. Gray) Greene var. thoreauensis (N. D. Atwood, S. L. Welsh & A. Clifford) Bierner & B. L. Turner, comb. nov.

  • Basionym: Hymenoxys argentea (A. Gray) K. F. Parker var. thoreauensis N. D. Atwood, S. L. Welsh & A. Clifford, Rhodora 109: 395–414, 2007. TYPE: UNITED STATES. New Mexico: McKinley Co.: North of Thoreau, 27 May 2003, A. Clifford 03-385 (Holotype: BRY; Isotypes: ASU! MO—as database image!).

  • Acknowledgment

    We thank John Strother for his help.

    Literature Cited


    Atwood, N. D. and S. L. Welsh. 2007. New taxa of Camissonia (Onagraceae); Erigeron, Hymenoxys, and Tetradymia (Compositae); Lepidium and Physaria (Cruciferae) from Arizona, New Mexico, and Utah. Rhodora 109: 395–414. Google Scholar


    Baldwin, B. G. and B. L. Wessa. 2000. Phylogenetic placement of Plucha and new subtribes in Helenieae sensu stricto (Compositae). Syst. Bot. 25: 522–538. Google Scholar


    Baldwin, B. G. and B. L. Wessa, and J. L. Panero. 2002. Nuclear rDNA evidence for major lineages of Helenioid Heliantheae (Compositae). Syst. Bot. 27: 161–198. Google Scholar


    Barkley, T. M. 1986. Hymenoxys , Pp. 962–964 in Flora of the Great Plains , eds. T. M. Barkley, R. E. Brooks, and E. K. Schofield. Lawrence, Kansas: University of Kansas Press. Google Scholar


    Bierner, M. W. 1978. Flavonoids of Plummera: taxonomic implications at the generic level within the Gaillardiinae. Biochem. Syst. Ecol. 6: 293–295. Google Scholar


    Bierner, M. W. 1994. Submersion of Dugaldia and Plummera in Hymenoxys (Asteraceae: Heliantheae: Gaillardiinae). Sida 16: 1–8. Google Scholar


    Bierner, M. W. 2001. Taxonomy of Hymenoxys subgenus Picradenia and a conspectus of the subgenera of Hymenoxys (Asteraceae: Helenieae: Tetraneurinae). Lundellia 4: 37–63. Google Scholar


    Bierner, M. W. and R. K. Jansen. 1998. Systematic implications of DNA restriction site variation in Hymenoxys and Tetraneuris (Asteraceae, Helenieae, Gaillardiinae). Lundellia 1: 17–26. Google Scholar


    Bierner, M. W. and B. L. Turner. 2003. Taxonomy of Tetraneuris (Asteraceae: Helenieae: Tetraneurinae). Lundellia 6: 44–96. Google Scholar


    Bierner, M. W. and B. L. Turner. 2006. Tetraneuris. Pp. 447–453 in Flora of North America North of Mexico. Volume 21. Asteraceae, part 3 , eds. Flora of North America Editorial Committee. New York: Oxford University Press. Google Scholar


    Bierner, M. W., J. G. Díaz, B. Barba, and W. Herz. 1992. Tetraneuris linearifolia var. arenicola (Asteraceae: Heliantheae): a new variety from south Texas. Sida 15: 231–239. Google Scholar


    Cronquist, A. 1994. Hymenoxys. Pp. 78–86 in Intermountain Flora. Vascular Plants of the Intermountain West, U.S.A. Volume 5. Asterales, A. Cronquist, eds. A. H. Holmgren, N. H. Holmgren, J. L. Reveal P. K. Holmgren. Bronx, New York: The New York Botanical Garden. Google Scholar


    Díaz, J. G., B. Barba, W. Herz, and M. W. Bierner. 1992. Sesquiterpene lactones and monoterpene glucopyranosides of Tetraneuris linearifolia var. arenicola. Phytochemistry 31: 3471–3477. Google Scholar


    Ferracini, V. L., F. Gao, M. W. Bierner, and T. J. Mabry. 1994. Sesquiterpene lactones and one flavonoid from Hymenoxys scaposa (DC.) K. Parker var. linearis (Nutt.) K. Parker. Biochem. Syst. and Ecol. 22: 111–112. Google Scholar


    Karis, P. O. and O. Ryding. 1994. Tribe Helenieae. Pp. 521–558 in Asteraceae: Cladistics & Classification , ed. K. Bremer. Portland, Oregon: Timber Press. Google Scholar


    Panero, J. L. 2007. Subtribe Tetraneuriinae. Pp. 404–405 in The Families of Vascular Plants , ed. K. Kubitzki, Volume VIII. Flowering Plants. Eudicots: Asterales , eds. J. W. Kadereit C. Jeffrey. Berlin, Heidelberg: Springer-Verlag. Google Scholar


    Spring, O., B. Zitterell-Haid, M. W. Bierner, and T. J. Mabry. 1994. Chemistry of glandular trichomes in Hymenoxys and related genera. Biochem. Syst. Ecol. 22: 171–195. Google Scholar


    Welsh, S. L. 1987. Compositae. Great Basin Naturalist Mem. 9: 131–240. Google Scholar
    Mark W. Bierner and Billie L. Turner "Transfer of Hymenoxys argentea var. Thoreauensis to Tetraneuris (Asteraceae: Helenieae: Tetraneuridinae)," Lundellia 2010(13), 1-2, (1 December 2010).
    Published: 1 December 2010
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