New sections inTaraxacum
Tóm tắt
Sectional taxonomy ofTaraxacum in steppe or subsaline habitats in Central Asia is revised based on material collected during expeditions, cultivated or studied in herbarium. Two new sections are described from that area:T. sect.Stenoloba similar toT. sect.Leucantha (syn.:T. sect.Sinensia), andT. sect.Suavia allied toT. sect.Dissecta. The type species of the sectionSuavia is described asTaraxacum formosissimum
Kirschner etŠtěpánek. Widespread mountain dandelions of the Caucasus, intermediate between the sect.Piesis andT. stevenii, are described asT. sect.Confusa. Taraxacum species dominating dry habitats in S Ukraine and Crimea are described asT. sect.Borysthenica. Species belonging to the new sections were found to be polyploid and agamospermous.
Tài liệu tham khảo
den Nijs J.C.M. Kirschner J., Štěpánek J. &Van der Hulst A. (1990): Distribution of diploid sexual plants ofTaraxacum sect.Ruderalia in east-central Europe, with special reference to Czechoslovakia.Pl. Syst. Evol. 170: 71–84.
Ge Xuejun, Ling Yeouruenn &Zhai Datong (1999):TaraxacumF.H. Wigg. In:LingYeouruenn &GeXuejun (eds.),Flora Reipublicae Popularis Sinica 80 (2), Compositae11, Science Press, Beijing, pp. 1–94.
Handel-Mazzetti H. (1907):Monographie der Gattung Taraxacum. Franz Deuticke, Leipzig & Wien.
Kirschner J. &Štěpánek J. (1993): The genusTaraxacum in the Caucasus, 1. Introduction, 2. The sectionPorphyrantha.Folia Geobot. Phytotax. 28: 295–320.
Kirschner J. &Štěpánek J. (1996a): Modes of speciation and evolution of sections inTaraxacum.Folia Geobot. Phytotax. 31: 415–426.
Kirschner J. &Štěpánek J. (1996b): Interpretation of some olderTaraxacum names from Asia.Edinb. J. Bot. 53: 215–221.
Kirschner J. &Štěpánek J. (1997): A nomenclatural checklist of supraspecific names inTaraxacum.Taxon 46: 87–98.
Kirschner J. &Štěpánek J. (1999): A revision ofTaraxacum sect.Piesis (Compositae).Folia Geobot. 33: 391–414.
Krasnikov A.A. (1997):TaraxacumWigg. In:KrasnoborovI.M. (ed.),Flora Sibiri (Flora of Siberia) 13, Nauka, Novosibirsk, pp. 263–295, 336, 423–430.
Krasnoborov I.M. (1984):Opredelitel’ rastenii Tuvinskoi ASSR (Identification key of plants of Truvinskaya ASSR). Nauka, Novosibirsk.
Schischkin B.K. &Tzvelev N.N. (1964): Oduvanchik —TaraxacumWigg. In:BobrovE.G. &TzvelevN.N. (eds.),Flora SSSR(Flora of the USSR) 29, Nauka, Moskva & Leningrad, pp. 405–560 et 728–754.
Tzvelev N.N. (1987): RodTaraxacumWigg. (Asteraceae) v Central’noi Azii (The genusTaraxacum (Asteraceae) in Central Asia).Novosti Sist. Vyssh. Rast. 24: 205–222.
van Soest J.L. (1963):Taraxacum species from India, Pakistan and neighbouring countries.Wentia 10: 1–91.
Wittzell H. (1999): Chloroplast DNA variation and reticulate evolution in sexual and apomictic sections of dandelions.Molec. Ecol. 8: 2023–2035.