Banksia subg. Banksia
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Banksia subg. Banksia is a valid botanic name for a subgenus of Banksia. As an autonym, it necessarily contains the type species of Banksia, B. serrata (Saw Banksia). Within this constraint, however, there have been various circumscriptions.
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[edit] According to George
The name was first published in Alex George's 1981 monograph The Genus Banksia L.f. (Proteaceae). George defined it as containing all Banksia taxa whose inflorescences are Banksia's typical "flower spike". Thus it was essentially a renaming of Stephan Endlicher's subgenus Eubanksia, which was in turn a renaming of Robert Brown's subgenus Banksia verae.[1]
In George's taxonomic arrangement of Banksia, B. subg. Banksia is further divided into three sections, primarily on the shape of the style:[2]
- B. sect. Banksia species have a straight or curved, but never hooked, style. This section contains about 50 species that are further divided into nine series;
- B. sect. Coccinea contains a single species, Banksia coccinea;
- B. sect. Oncostylis contains those species whose styles are hooked. It contains about 20 species, which are further divided into four series.
[edit] According to Thiele and Ladiges
In 1996, Kevin Thiele and Pauline Ladiges published the results of a cladistic analysis of Banksia. They found George's arrangement to accord fairly closely with their inferred cladogram, so sought to publish a taxonomic arrangement that reflected their phylogeny whilst being minimally disruptive to the then-current arrangement. They found that George's conception of B. subg.Banksia could be made monophyletic if B. elegans (Elegant Banksia) was excluded; they ended up listing B. elegans and five other species as incertae sedis, but otherwise maintained George's circumscription of the subgenus.[3]
In Thiele and Ladiges' taxonomic arrangement of Banksia, B. subg. Banksia is divided into twelve series:
- B. ser. Tetragonae
- B. ser. Lindleyanae
- B. ser. Banksia
- B. ser. Prostratae
- B. ser. Cyrtostylis
- B. ser. Ochraceae
- B. ser. Grandes
- B. ser. Salicinae
- B. ser. Spicigerae
- B. ser. Quercinae
- B. ser. Dryandroideae
- B. ser. Abietinae
[edit] According to Mast and Thiele
In 2005, Austin Mast, Eric Jones and Shawn Havery published the results of their cladistic analyses of DNA sequence data for Banksia. They inferred a phylogeny very greatly different from the accepted taxonomic arrangement, including finding Banksia to be paraphyletic with respect to Dryandra.[4] A new taxonomic arrangement was not published at the time, but early in 2007 Mast and Thiele initiated a rearrangement by transferring Dryandra to Banksia, and publishing B. subg. Spathulatae for the species having spoon-shaped cotyledons. Thus B. subg. Banksia was redefined as containing the species lacking spoon-shaped cotyledons. Mast and Thiele have foreshadowed publishing a full arrangement once DNA sampling of Dryandra is complete.[5]
[edit] See also
[edit] References
- ^ George, Alex S. (1981). "The Genus Banksia L.f. (Proteaceae)". Nuytsia 3 (3): 239–473.
- ^ George, Alex S.. (1999). "Banksia". Flora of Australia Volume 17B: Proteaceae 3: Hakea to Dryandra: 175–251. Ed. Wilson, Annette (ed.). Collingwood, Victoria: CSIRO Publishing / Australian Biological Resources Study. ISBN 0-643-06454-0.
- ^ Thiele, Kevin; Pauline Y. Ladiges (1996). "A Cladistic Analysis of Banksia (Proteaceae)". Australian Systematic Botany 9 (5): 661-733. DOI:10.1071/SB9960661.
- ^ Mast, Austin R.; Eric H. Jones and Shawn P. Havery (2005). "An Assessment of Old and New DNA sequence evidence for the Paraphyly of Banksia with respect to Dryandra (Proteaceae)". Australian Systematic Botany 18 (1): 75-88. DOI:10.1071/SB04015.
- ^ Mast, Austin R. and Kevin Thiele (2007). "The transfer of Dryandra R.Br. to Banksia L.f. (Proteaceae)". Australian Systematic Botany 20: 63–71. DOI:10.1071/SB06016.
[edit] External links
