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Claytonia sibirica mature flowers 

Claytonia sibirica mature flowers 

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Figure 1. Perianth diversity in the Caryophyllales - adapted from...
Figure 2. Glinus dahomensis SEM figure plate 
Figure 3. Portulaca oleracea SEM figure plate 
Figure 4. Claytonia perfoliata SEM figure plate A-inflorescence;...
+10 Figure 5. Claytonia sibirica SEM figure plate 
The criptic evolution of petaloids in the Portulacinae, Caryophyllales
Thesis
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  • Aug 2011
The evolution of the perianth evolution was a key event for the evolutionary success of Angiosperms. The origin of petals is still unclear in some groups, and it is believed that they evolved from either bracts or stamens. Caryophyllales is an order that deserves special attention, as petals were lost in ancestors of the clade and a bipartite peria...
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Micromorphological Evidence For Androecium Origin Of Claytonia (Montiaceae) Petaloids
Article
Full-text available
  • Apr 2012
Caryophyllales is an order distinguished for having flowers with only one perianth whorl – the perigone. The perigone is a calyx derived structure that can have either petaloid or sepaloid appearance. Members of the Portulacinae suborder have tendency to have a false bipartite perianth, forming a petaloid perigone and an epicalyx with the subtending bracts of the flower. Although Claytonia belongs to the Portulacinae suborder, previous studies have suggested a different origin for its petaloid organs other than the sepals. In this study we investigated the floral development of Claytonia sibirica and Claytonia perfoliata using Scanning Electron Microscopy (SEM) to understand the origin of the petaloid organs in the genus. Our results show that petaloid organs in Claytonia are of androecium origin and can be interpreted as the expression of the typical Caryophyllales' perigone growing in androecium tissue.
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