Abstract
This study aimed to characterize the stem, peduncle, and leaf anatomy of 22 species of Sedum senso lato distributed in Iran. The results showed that the presence of tanniniferous storage cells in stems and leaves, distinct xylem vessels in stems, and the shape of peduncle cross sections, were taxonomically informative evidence, and isolated Phedimus from the other studied taxa of Sedum s.l. , whereas hairy leaves and peduncles containing starch storage cells were identified as Prometheum and Hylotelephium respectively. In addition, the current anatomical evidence confirmed the alliance of 2 sections of Sedum and Epeteium within Sedum sensu stricto. The result of numerical analysis including 31 qualitative and quantitative anatomical characters supported complete separation of the fourallied genera and revealed significant influence of anatomical traitsin taxonomy of Sedum s.l.
Highlights
Sedum L., comprising ca. 420 species, is the most speciesrich member of the family Crassulaceae (Thiede and Eggli, 2007; Nikulin et al, 2016)
Underneath the epidermis was a collenchymatous region consisting of 1–3 cell layers. This region was absent in S. caespitosum (Figure 2j) A parenchymatous cortex comprising circular compact cells was located between the collenchyma and the endodermis
Cortical bundles were observed in the parenchymatous tissue of S. tetramerum (Figure 2a) and S. pallidum (Figure 2c)
Summary
Sedum L., comprising ca. 420 species, is the most speciesrich member of the family Crassulaceae (Thiede and Eggli, 2007; Nikulin et al, 2016). Several previous authors (Paraeger, 1921;Froderstrom, 1936; Clausen, 1975) considered Sedum as a hold-all taxon, containing only a few additional genera within the subfamily Sedoideae, whereas others (Borissova, 1969; Ohba, 1977a, 1978b; Grulich, 1984) divided the genusinto controversial genera (Van Ham andt Hart, 1998; Mort et al, 2001; Giuliani,2017), among which the Asian Hylotelephium Ohba, Phedimus Rafin, Rhodiola L., and Umblicus Dc. gained wide taxonomic recognition and were completely separated from Sedum based on molecular data (Mauyzumi and Ohba, 2004;Gontcharova and Gontcharov, 2009; Nikulin et al, 2016). The current survey aims to describe the anatomical structure of the stem, peduncle, and leaf of Iranian representatives of Sedum s.l. to determine diagnostic characters and to evaluate the extent to which these evidences can be used for separating the taxonomic ranks
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