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6 results for “Cephalocereus”
FIGURE 4 in A new species of Cephalocereus (Cactaceae) from southern Mexico
FIGURE 4. Phylogenetic position of Cephalocereus parvispinus based on seven chloroplast markers. Bayesian inference, posterior probabilities are indicated at the nodes.
FIGURE 2 in A new species of Cephalocereus (Cactaceae) from southern Mexico
FIGURE 2.Reproductive structures of Cephalocereus parvispinus.A. Flower on fertile zone. B. Apex of fertile stem. C. Flower in longitudinal section, showing inner and outer sections. D. Stems and fruits. E. Fruits.
FIGURE 3 in A new species of Cephalocereus (Cactaceae) from southern Mexico
FIGURE 3. SEM micrographs of Cephalocereus parvispinus seeds. A. Lateral view. B. Hilum-micropylar region. C. Close-up of lateral view.
FIGURE 1 in A new species of Cephalocereus (Cactaceae) from southern Mexico
FIGURE 1. Main characteristics of Cephalocereus parvispinus.A. Plants in its habitat. B. Arborescent plant. C. Juvenile plants. D. Apex of infertile stem.
Data from: Phylogeny and circumscription of Cephalocereus (Cactaceae) based on molecular and morphological evidence
Cephalocereus, Neobuxbaumia, and Pseudomitrocereus (Cactaceae, Cactoideae, Echinocereeae) are related genera of columnar cacti native to Mexico with current ambiguous circumscription. We applied maximum parsimony and Bayesian inference methods to reconstruct the phylogeny of the Cephalocereus group using molecular data from seven chloroplast regions (petL-psbE, psbA-trnH, rpl16, rpl32-trnLUAG, trnL-F, trnQrps16, andycf1), simple coded indels, and 46 structural characters. The Cephalocereus group was recovered as monophyletic with high support values, whereas Neobuxbaumia appeared as paraphyletic, due to the polyphyly of Cephalocereus and the derived position of Pseudomitrocereus within this group. Topology was mostly congruent among the different phylogenetic methods explored, and three pervasive clades were observed. Two structural characters were confirmed as synapomorphies for the Cephalocereus group: prismatic crystals in the dermal system and a perianth woody cap persistent in the fruit. The derived position of Pseudomitrocereus suggests that new hypotheses must be explored regarding the possible hybrid origin of this taxon. We propose the transfer of all species of Neobuxbaumia, Cephalocereus, and Pseudomitrocereus to a single genus, in which Cephalocereus takes priority over the other names. Based on our results, a new circumscription for Cephalocereus is proposed, including a taxonomic synthesis, two new combinations (Cephalocereus multiareolatus and Cephalocereus sanchezmejoradae), and a key for species.
Data from: Phylogeny and circumscription of Cephalocereus (Cactaceae) based on molecular and morphological evidence
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