CYTOGENETICS, DISTRIBUTION, AND AMPHITROPICAL AFFINITIES OF SOUTH AMERICAN CAMISSONIA (ONAGRACEAE)
1970; Oxford University Press; Volume: 24; Issue: 4 Linguagem: Inglês
10.1111/j.1558-5646.1970.tb01817.x
ISSN1558-5646
Autores Tópico(s)Plant Taxonomy and Phylogenetics
ResumoThe genus Camissonia Link, currently considered to contain 61 species (Raven, 1969), has only one species in western and southern South America, all the others being found in North America, mostly in the western United States and adjacent Mexico. Camissonia is thus one of a large number of amphitropical species and genera of plants having distributions in the Americas and it belongs to the group of some 95 such temperate that are principally western North American in the Northern Hemisphere (Raven, 1963). The interpretation of such distribution patterns can be greatly facilitated by applying the techniques of modern taxonomy to the plant groups involved. Amongst these techniques, cytogenetics and the related approaches of biosystematics are particularly appropriate when considering closely related species and their constituent populations. There is a growing body of such biosystematic information on American amphitropical disjuncts in such genera as Clarkia (Raven and Lewis, 1959), Gilia (Grant, 1954, 1965), Phacelia (Heckard, 1963), Agoseris (Chambers, 1963), Blennosperma (Ornduff, 1963), Lasthenia (Ornduff, 1963, 1966), Madia (Clausen, 1951), and Microseris (Chambers, 1963), and some data are now available for Camissonia. The purpose of this paper is to present information on the variation and distribution of the South American Camissonia dentata (Cav.) Reiche and on its affinities with its North American relative C. strigulosa (Fisch. & Mey.) Raven.
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