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Comments on the Generic Concepts in the Eupatorieae
H. Robinson and R. M. King
Vol. 34, No. 1 (Feb., 1985), pp. 11-16
Published by: International Association for Plant Taxonomy (IAPT)
Stable URL: http://www.jstor.org/stable/1221557
Page Count: 6
You can always find the topics here!Topics: Genera, Biological taxonomies, Taxa, Evolution, Anthers, Ploidies, Definability, Appendages, Geography, Species
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Traditional genera of the tribe, based heavily on characters of the pappus and anther appendage, prove totally indefensible, having been subjected to piecemeal alterations by all significant workers since Linnaeus, and being useless for comparison with any new evidence. The total tribal revision of the present authors, based on structure, cytology, geography and chemistry, has 180 genera in 18 subtribes. What was Eupatorium has been distributed among 11 of the subtribes, and is intermixed with elements of other traditional genera. Eupatorium (44 sp., x = 10) remains a distinct arcto-tertiary genus. Mikania (410 sp., x = 18-20), Stevia (229 sp., x = 11, 12), Liatris (42 sp., x = 10), and Brickellia (96 sp., x = 9) have minor changes. Ageratum (40 sp., x = 10) is broadened to include epappose species. Ageratina (230 sp., x = 17), the epiphytic Neomirandea (25 sp., x = 17, 20), Chromolaena (165 sp.), Fleischmannia (79 sp.), Koanophyllon (115 sp.) (all x = 10) are named or restructured to include much that was in Eupatorium. The subtribe Gyptidinae, mostly of eastern Brazil, is one of the two most complex, but has many particularly distinct genera such as Campuloclinium (14 sp.), Trichogonia (30 sp.), Lasiolaena (5 sp.) and Agrianthus (6 sp.) (all x = 10). Most problems of numerous small genera and hybridization involve the largest subtribe Critoniinae of the moist Neotropics, but tests of many individual genera have reinforced their distinct status, i.e., Critonia (38 sp.), Ophryosporus (37 sp.), Fleischmanniopsis (5 sp.) and Neocabreria (5 sp.) (all x = 10). The reclassification reflects the fact that the tribe is neither simple nor comparatively derived in the family.
Taxon © 1985 International Association for Plant Taxonomy (IAPT)