Bentham's Taxonomic Arrangement Of Dryandra

George Bentham's taxonomic arrangement of ''Dryandra'' (now ''B.'' ser. ''Dryandra'') was published in 1870, in Volume 5 of Bentham's ''Flora Australiensis''. It replaced the 1856 arrangement of Carl Meissner, and stood for over a century before being replaced by the 1996 arrangement of Alex George.

Background

The dryandras are a group of proteaceous shrubs endemic to southwest Western Australia. For nearly two hundred years they were considered a separate genus, having been published at that rank in 1810 by Robert Brown. In 2007 it was transferred into the genus ''Banksia'' as ''B.'' ser. ''Dryandra''. There are now just under 100 species, plus numerous subspecies and varieties.

The first infrageneric arrangement of ''Dryandra'' was Brown's 1810 arrangement, which listed 13 species, but did not attempt an infrageneric classification. Twenty years later, Brown published a revised arrangement which divided 23 recognised species in three subgenera, and placed one further species in a separate genus ''Hemiclidia''. This was followed by the 1856 arrangement of Carl Meissner, which recognised 53 species and six varieties, dividing them into three sections and eight series, and maintaining the monospecific genus ''Hemiclidia''.

Bentham's arrangement

Bentham's arrangement was published in 1870, in Volume V of ''Flora Australiensis''. He reduced the number of species to 47, and the number of varieties to two, proposing an arrangement consisting of two sections and seven series. ''Hemiclidia'' was transferred back into ''Dryandra''.

George Bentham's 1870 taxonomic arrangement of ''Dryandra'' may be summarised as follows:
:Genus ''Dryandra'' (now ''Banksia'' ser. ''Dryandra'')
::Section ''Eudryandra''
:::Series '' Armatæ''
::::''D. quercifolia'' (now '' B. heliantha'')
::::''D. praemorsa'' (now '' B. undata'')
::::''D. cuneata'' (now '' B. obovata'')
::::''D. falcata'' (now '' B. falcata'')
::::''D. armata'' (now '' B. armata'')
::::''D. longifolia'' (now '' B. prolata'')
::::''D. Fraseri'' (now '' B. fraseri'')
:::Series '' Floribundæ''
::::''D. floribunda'' (now ''B. sessilis'' var. ''sessilis'')
:::::''D. floribunda'' var. ''major'' (now ''B. sessilis'' var. ''cordata'')
::::''D. carduacea'' (now ''B. squarrosa'' subsp. ''squarrosa'')
::::''D. carlinoides'' (now '' B. carlinoides'')
::::''D. polycephala'' (now '' B. polycephala'')
::::''D. Kippistiana'' (now '' B. kippistiana'')
:::Series '' Concinnæ''
::::''D. squarrosa'' (now '' B. squarrosa'')
::::''D. serra'' (now '' B. serra'')
::::''D. concinna'' (now '' B. concinna'')
::::''D. foliolata'' (now '' B. foliolata'')
:::Series '' Formosæ''
::::''D. stupposa'' (now '' B. stuposa'')
::::''D. nobilis'' (now '' B. nobilis'')
::::''D. mucronulata'' (now '' B. mucronulata'')
::::''D. formosa'' (now '' B. formosa'')
::::''D. Baxteri'' (now '' B. biterax'')
:::Series '' Niveæ''
::::''D. nivea'' (now '' B. nivea'')
::::''D. arctotidis'' (now '' B. arctotidis'')
:::::''D. arctotidis'' var. ''tortifolia'' (now '' B. tortifolia'')
::::''D. nana'' (now '' B. nana'')
::::''D. Preissii'' (now '' B. acuminata'')
:::Series '' Obvallatæ''
::::''D. sclerophylla'' (now '' B. sclerophylla'')
::::''D. pulchella'' (now '' B. bella'')
::::''D. plumosa'' (now '' B. plumosa'')
::::''D. seneciifolia'' (now '' B. seneciifolia'')
::::''D. vestita'' (now '' B. vestita'')
::::''D. cirsioides'' (now '' B. cirsioides'')
::::''D. Hewardiana'' (now '' B. hewardiana'')
::::''D. patens'' (now ''B. hewardiana'')
::::''D. conferta'' (now '' B. densa'')
::::''D. horrida'' (now '' B. horrida'')
::::''D. serratuloides'' (now '' B. serratuloides'')
::::''D. comosa'' (now '' B. comosa'')
:::Series '' Gymnocephalæ''
::::''D. Shuttleworthiana'' (now '' B. shuttleworthiana'')
::::''D. speciosa'' (now '' B. splendida'')
::::''D. tridentata'' (now '' B. tridentata'')
::Section '' Aphragma''
::::''D. tenuifolia'' (now '' B. tenuis'')
::::''D. proteoides'' (now '' B. proteoides'')
:::::''D. proteoides'' var. ''ferruginea'' (now '' B. rufa''
::::''D. runcinata'' (now ''B. r.'' subsp. ''rufa'')
::::''D. obtusa'' (now '' B. obtusa'')
::::''D. bipinnatifida'' (now '' B. bipinnatifida'')
::::''D. pteridifolia'' (now '' B. pteridifolia'')
::::''D. calophylla'' (now '' B. calophylla'')

Legacy

Bentham's arrangement remained the accepted arrangement of ''Dryandra'' 126 years. It was finally replaced in 1996 by a new arrangement published by Alex George. George's arrangement retained a number of Bentham's infrageneric taxa.

In 2007, Austin Mast and Kevin Thiele transferred ''Dryandra'' into ''Banksia'', on the grounds that ''Banksia'' was paraphyletic with respect to ''Dryandra''. Mast and Thiele were not yet ready to proffer an arrangement for the new circumscription of ''Banksia'', so as an interim measure they transferred ''Dryandra'' at series rank, so as to minimise disruption to the nomenclature. Thus the infrageneric arrangement of ''Dryandra'' has been set aside, at least temporarily, and hence none of Bentham's infrageneric taxa are in current use.

References

{{reflist

1870 introductions
Taxonomy of Banksia