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A preliminary analysis of the phylogeny of the Swertiinae (Gentianaceae) based on ITS data

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To better understand the floral diversity and the phylogeny of the Swertiinae (Gentianaceae), the internal transcribed spacer (ITS) region of nrDNA for 17 species and one outgroup was sequenced. Our data suggest that corolla type, gland shape, and corolla appendage are poorly correlated with the ITS phylogeny. The genus Swertia s.l. and the rotate group previously recognized based on the corolla types and gland shapes are polyphyletic. Four genera with simple protruding glands and three taxa with corolla appendages are not clustered as the monophyletic groups. Four separate clades, corresponding to the four sections, were identified in Swertia s.l. Lomatogoniopsis with the simple protruding gland type of the tubular group closely related to Lomatogonium of the rotate group. The deeply lobing corolla and concave foveae may be ancestral in the Swertiinae, while the tubular corolla and the protruding glands may have undergone convergent evolution.

Affiliations: 1: Northwest Plateau Institute of Biology, Chinese Academy of Sciences Ljqdxy@public.xn.qh.cn ; 2: Forestry and Forest Products Research Institute ; 3: Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences

10.1560/LFYE-YVHQ-BBTH-KMEC
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/content/journals/10.1560/lfye-yvhq-bbth-kmec
2001-05-13
2018-07-20

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