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                <title xml:lang="en">Major trends in stem anatomy and growth forms in the perianth-bearing Piperales, with special focus on Aristolochia.</title>
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                <term xml:lang="en">Perianth-bearing Piperales</term>
                <term xml:lang="en">Aristolochia</term>
                <term xml:lang="en">Secondary woodiness</term>
                <term xml:lang="en">Asarum</term>
                <term xml:lang="en">Heterochrony</term>
                <term xml:lang="en">Growth form</term>
                <term xml:lang="en">Biomechanics</term>
                <term xml:lang="en">Anatomy</term>
                <term xml:lang="en">Thottea</term>
                <term xml:lang="en">Saruma</term>
                <term xml:lang="en">Lactoris</term>
                <term xml:lang="en">Hydnora</term>
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              <p>BACKGROUND AND AIMS: The order Piperales has the highest diversity of growth forms among the earliest angiosperm lineages, including trees, shrubs, climbers and herbs. However, within the perianth-bearing Piperales (Asarum, Saruma, Lactoris, Hydnora, Prosopanche, Thottea and Aristolochia), climbing species only occur in the most species-rich genus Aristolochia. This study traces anatomical and morphological traits among these lineages, to detect trends in growth form evolution and developmental processes. METHODS: Transverse stem sections of different developmental stages of representatives of Asarum, Saruma, Lactoris, Hydnora, Thottea and Aristolochia were compared and anatomical traits were linked to growth form evolution. Biomechanical properties of representative climbers were determined in three-point bending tests and are discussed based on the anatomical observations. Growth form evolution of the perianth-bearing Piperales was reconstructed by ancestral character state reconstruction using Mesquite. KEY RESULTS: While species of Asarum and Saruma are exclusively herbaceous, species of the remaining genera show a higher diversity of growth habit and anatomy. This growth form diversity is accompanied by a more complex stem anatomy and appropriate biomechanical properties. The ancestral growth form of the perianth-bearing Piperales is reconstructed with either a shrub-like or herbaceous character state, while the following three backbone nodes in the reconstruction show a shrub-like character state. Accordingly, the climbing habit most probably evolved in the ancestor of Aristolochia. CONCLUSIONS: Since the ancestor of the perianth-bearing Piperales has been reconstructed with a herb- or shrub-like habit, it is proposed that the climbing habit is a derived growth form, which evolved with the diversification of Aristolochia, and might have been a key feature for its diversification. Observed anatomical synapomorphies, such as the perivascular fibres in Lactoris, Thottea and Aristolochia, support the phylogenetic relationship of several lineages within the perianth-bearing Piperales. In addition, the hypothesis that the vegetative organs of the holoparasitic Hydnoraceae are most probably rhizomes is confirmed.</p>
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