Abstract
Analysis of several populations in a large part of the distribution area of the genusEmilia in Brazil has revealed only two species: the diploidE. sonchifolia and the tetraploidE. fosbergii. The more widely reportedE. coccinea was not found. They show a karyotype constancy in morphology and chromosome number (2n = 10 and 2n = 20, respectively), C-banding pattern and number of secondary constrictions. Some indications were found thatE. fosbergii may be an allopolyploid and that its ancestors had different genome sizes.
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Badr, A., Elkington, T. T., 1984: Giemsa C-banded karyotypes and taxonomic relationship of some N. AmericanAllium spp. and their relationship to Old World species (Liliaceae). — Pl. Syst. Evol.144: 17–24.
Baldwin, J. T., Jr., 1946: Cytogeography ofEmilia Cass. in the Americas. — Bull. Torrey Bot. Club73: 18–23.
—,Speese, B. M., 1949: Cytogeography ofEmilia in West Africa. — Bull. Torrey Bot. Club76: 346–351.
Barkley, T. M., Cronquist, A., 1978:Emilia. — In: North American Flora Ser. II, part 10, pp. 147–150. — New York: The New York Botanical Garden.
Coleman, J. R., 1968: Chromosome numbers in some BrazilianCompositae. — Rhodora70: 228–240.
—,Campello, M. L., 1984: Cytogenetics of a mixed Brazilian population ofEmilia sonchifolia (L.) DC. andE. coccinea (Sims)G. Don (Compositae). — Rev. Brasil. Genet.7: 83–94.
Fedorov, An. A., (Ed.), 1969: Chromosome numbers of flowering plants. — Leningrad: Komarov Botanical Institute.
Frankel, O. H., Gerlach, W. L., Peacock, W. J., 1987: The ribosomal RNA genes in synthetic tetraploids of wheat. — Theor. Appl. Genet.75: 138–143.
Goldblatt, P., 1981: Index to plant chromosome numbers 1975–1978. — St. Louis: Missouri Botanical Garden.
Guerra, M. S., 1983: O uso do Giemsa na citogenética vegetal—comparação entre a coloração simples e o bandeamento. — Ci. & Cult.35: 190–193.
—, 1986a: Citogenética de angiospermas coletadas em Pernambuco 1. — Rev. Brasil. Genet.9: 21–40.
—, 1986b: Reviewing the chromosome nomenclature ofLevan & al. — Rev. Brasil. Genet.9: 741–743.
—, 1988: Characterization of different types of condensed chromatin inCostus (Zingiberaceae). — Pl. Syst. Evol.158: 107–115.
Kodama, Y., Yoshida, M. C., Sasaky, M., 1980: An improved silver staining technique for nucleolus organizer regions by using a nylon cloth. — Japan. J. Hum. Genet.25: 229–233.
Lacadena, J. R., Cermeno, M. C., Santos, J. L., 1984: Evidence for wheat-rye nucleolar competition (amphiplasty) inTriticale by silver-staining procedure. — Theor. Appl. Genet.67: 207–213.
Lorenzi, H., 1982: Plantas daninhas do Brasil: terrestres, aquáticas, parasitas, tóxicas e medicinais. — Nova Odessa: Edição do Autor.
Nicolson, D. N., 1975:Emilia fosbergii, a new species. — Phytologia32: 33–34.
—, 1980: Summary of cytological information onEmilia and the taxonomy of four Pacific taxa ofEmilia (Asteraceae: Senecioneae). — Syst. Bot.5: 391–407.
Nogueira, M. T. M., Guerra, M. S., 1983: Número cromossômico deEmilia sonchifolia (L.) DC. eEmilia sagittata (DC.)Vahl. em populações brasileiras. — Ci. & Cult.35 (supl.): 662.
Olorode, O., 1973: Meiotic studies of diploid hybrids betweenEmilia sonchifolia andE. coccinea (Compositae). — Cytologia38: 725–729.
—,Olorunfemi, A. E., 1973: The hybrid origin ofEmilia practermissa (Senecioneae: Compositae). — Ann. Bot.37: 185–191.
Schwarzacher, T., Ambros, P., Schweizer, D., 1980: Application of Giemsa banding to orchid karyotype analysis. — Pl. Syst. Evol.134: 293–297.
Siljak-Yakovlev, S., Cartier, D., 1982: Comparative analysis of C-band karyotypes inCrepis praemorsa subsp.praemorsa and subsp.dinarica. — Pl. Syst. Evol.141: 85–90.
Torres, A. M., Liogier, A. H., 1970: Chromosome number of DominicanCompositae. — Brittonia22: 240–245.
Turner, B. L., Irwin, H. S., 1960: Chromosome number in theCompositae 2. Meiotic counts for fourteen species of BrazilianCompositae. — Rhodora62: 122–126.
—,King, R. M., 1964: Chromosome number in theCompositae. 8. Mexican and Central American species. — Southwestern Naturalist9: 27–39.
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Guerra, M.d.S., Nogueira, M.T.M. The cytotaxonomy ofEmilia spp. (Asteraceae: Senecioneae) occurring in Brazil. Pl Syst Evol 170, 229–236 (1990). https://doi.org/10.1007/BF00937706
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DOI: https://doi.org/10.1007/BF00937706