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Article
Reclassification of North American Haplopappus (Compositae: Astereae) Completed: Rayjacksonia Gen Nov
American Journal of Botany
  • M. A Lane
  • Ronald L Hartman, University of Wyoming
Document Type
Article
Publication Date
3-1-1996
Disciplines
Abstract
Rayjacksonia R. L. Hartman & M. A. Lane, gen. nov. (Compositae: Astereae), is named to accommodate the ''phyllocephalus complex,'' formerly of Haplopappus Cass. sect. Blepharodon DC. The new combinations are R. phyllocephalus (DC.) R. L. Hartman & M. A. Lane, R. annua (Rydb.) R. L. Hartman & M. A. Lane, and R. aurea (A. Gray) R. L. Hartman & M. A. Lane. This transfer completes the reclassification of the North American species of Haplopappus sensu Hall, leaving that genus exclusively South American. Rayjacksonia has a base chromosome number of x = 6. Furthermore, it shares abruptly ampliate disk corollas, deltate disk style-branch appendages, and corolla epidermal cell type, among other features, with Grindelia, Isocoma, Olivaea, Prionopsis, Stephanodoria, and Xanthocephalum. Phylogenetic analyses of morphological and chloroplast DNA restriction site data, taken together, demonstrate that these genera are closely related but distinct.
DOI
10.2307/2446170
Comments
The original publication is available at http://www.jstor.org/stable/2446170
Citation Information
M. A Lane and Ronald L Hartman. "Reclassification of North American Haplopappus (Compositae: Astereae) Completed: Rayjacksonia Gen Nov" American Journal of Botany Vol. 83 Iss. 3 (1996) p. 356 - 370
Available at: http://works.bepress.com/ronald_hartman/4/