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Generic Boundaries in the Tribe Sileneae (Caryophyllaceae) as Inferred from Nuclear rDNA Sequences

Bengt Oxelman and Magnus Lidén
Taxon
Vol. 44, No. 4 (Nov., 1995), pp. 525-542
DOI: 10.2307/1223498
Stable URL: http://www.jstor.org/stable/1223498
Page Count: 18
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Generic Boundaries in the Tribe Sileneae (Caryophyllaceae) as Inferred from Nuclear rDNA Sequences
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Abstract

The relationships within the tribe Sileneae (Caryophyllaceae, Caryophylloideae) were deduced from nucleotide sequence variation in the nuclear ribosomal DNA. The internal transcribed spacer (ITS) regions and the intervening 5.8S gene were sequenced for 76 ingroup and five outgroup taxa. The relationships were analysed more closely for 26 of these, with the addition of 822 aligned positions from the 28S gene. Drypis appears not to belong in Sileneae, and perhaps not even in Caryophylloideae. Agrostemma is sister group to the rest of the tribe. Eudianthe (Silene coeli-rosa and S. laeta) and Petrocoptis are clearly separated from the core Silene. Steris (Viscaria), Silene sect. Heliosperma, sect. Rupifraga, and sect. Compactae together form a strongly supported clade, as do Lychnis plus Uebelinia. Cucubalus, Melandrium, and Gastrolychnis are nested within a weakly supported "Silene". Polyschemone, previously often misplaced in Lychnis, is apparently closely related to Silene acaulis. Within the core Silene, three main groups can be identified, corresponding roughly to three of Rohrbach's (1869) five main generic subdivisions, S. subg. Behen, sect. Cincinnosilene, and sect. Botryosilene. Pleconax, Melandrium, Cucubalus, and Gastrolychnis nest within S. subg. Behen, but the monophyly of this group is weakly supported. Members of S. sect. Dichasiosilene are scattered over all three groups, indicating that dichasium is plesiomorphic within the group.

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