Karyological studies in Compositae V

Hunziker, Juan H.; Wulff, Arturo F.; Xifreda, Cecilia Carmen; Escobar, Alejandro
January 1989
Darwiniana;1989, Vol. 29 Issue 1-4, p25
Academic Journal
Chromosome numbers were determined and observations on the meiotic behavior were made in 60 taxa belonging to 33 genera of eight tribes of the Compositae. The genera Chersodoma Philippi and Chilliotrichiopsis Cabrera and twenty seven species and varieties are investigated cytologically for the first time. These are as follows: Eupatorium amplum Benth. (41 II), E. argentinum Ariza Espinar (20 II), E. serratum Sprengel (10 II), E. tweedianum H. et A. (10 II), Baccharis notosergila Griseb. (9 II), B. petiolata DC. (ca. 9 II), B. leptophylla DC (9 II), B. rufescens Sprengel var. ventanicola Cabrera (9 II), Chilliotrichiopsis keideli Cabrera (2n = 54), Conyza notobellidiastrum Griseb. (9 II), C. burkartii Zardini (18 II), Bidens andicola Kunth var. decomposita Kuntze (12 II), Viguiera weberbaueri S. F. Blake (17 II), Helenium alternifolium (Sprengel) Cabrera (34 II), Chersodoma argentina Cabrera (2n = 20), Gynoxis fuliginosa (Kunth) Cass. (ca. 40 II), Senecio cremeiflorus Mattf. (20 II), S. donianus Hook. et Arn. (ca. 40 II), S. leptolobus DC (20 II), S. madagascariensis Poiret (20 II), S. pulcher Hook. et Arn (40 II), S. saltensis Hook. et Arn (20 II), S. scorzonerifolius Meyer et Walp. (40 II), S. subumbellatus Phil. (20 II), S. volkmanni Phil. (40 II), Leuceria landbeckii (Phil.) Reiche (20 H), Leuceria scrobiculata Don, (20 II), Mutisia linearifolia Car. (23 II). Different chromosome numbers to those reported previously in the literature were found for Eupatorium arnottianum Griseb. (11 II + 1 -2B), Gutierrezia gilliesii Griseb. (16 II), Polymnia pyramidalis Triana (ca. 29 II), Senecio humillimus Schultz Bip. (ca. 40 II) and Mutisia retrorsa Cav. (24 II). The significance of some of the results in relation to taxonomical and evolutionary problems is discussed.


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