Oleandra

Oleandra is a genus of ferns. In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), it is the only genus in the family Oleandraceae, which is placed in suborder Polypodiineae, order Polypodiales.[1] Alternatively, the family may be placed in a very broadly defined family Polypodiaceae sensu lato as the subfamily Oleandroideae.[2]

Oleandra
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Class: Polypodiopsida
Order: Polypodiales
Suborder: Polypodiineae
Family: Oleandraceae
Ching ex Pic.Serm.
Genus: Oleandra
Cav.

The genus contains about 15 species.[1] Most are erect ground ferns or scandent epiphytes that start from the ground. The lamina (leafy area of the fronds) are simple or pinnate, and the individual pinnae are articulate to the rachis. The sporangia are contained in discrete round sori in a single row on either side of the midrib of the fronds.

Phylogeny

The following cladogram for the suborder Polypodiineae (eupolypods I), based on the consensus cladogram in the Pteridophyte Phylogeny Group classification of 2016 (PPG I),[1] shows a likely phylogenetic relationship between Oleandraceae and the other families of the clade.

Polypodiineae (eupolypods I)
 

Didymochlaenaceae

 
 
 

Hypodematiaceae

 
 
 

Dryopteridaceae

 
 
 
 

Nephrolepidaceae

 
 

Lomariopsidaceae

 
 
 
 

Tectariaceae

 
 
 

Oleandraceae

 
 
 

Davalliaceae

 
 

Polypodiaceae

 
 
 
 
 
 
 
 
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References
  1. PPG I (2016), "A community-derived classification for extant lycophytes and ferns", Journal of Systematics and Evolution, 54 (6): 563–603, doi:10.1111/jse.12229
  2. Christenhusz, Maarten J.M. & Chase, Mark W. (2014). "Trends and concepts in fern classification". Annals of Botany. 113 (9): 571–594. doi:10.1093/aob/mct299. PMC 3936591. PMID 24532607.
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