Thiele and Ladiges' taxonomic arrangement of Banksia

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Kevin Thiele and Pauline Ladiges taxonomic arrangement of Banksia , published in 1996, was a novel taxonomic arrangement that was intended to align the taxonomy of Banksia more closely with the phylogeny that they had inferred from their cladistic analysis of the genus. It replaced Alex George's 1981 arrangement, but most aspects were not accepted by George, and it was soon replaced by a 1999 revision of George's arrangement. However some herbaria have continued to follow Thiele and Ladiges on some points.

Contents

Background

Banksia is a genus of around 80 species in the plant family Proteaceae. An iconic Australian wildflower and popular garden plant, they are easily recognised by their characteristic flower spikes and fruiting "cones". They grow in forms varying from prostrate woody shrubs to trees up to 35 metres tall, and occur in all but the most arid areas of Australia. As heavy producers of nectar, they are important sources of food for nectariferous animals such as honeyeaters and honey possums, and they are of economic importance to the nursery and cut flower industries. However they are seriously threatened by a number of processes including land clearing, frequent burning, and disease, and a number of species are rare and endangered.

Specimens of Banksia were first collected by Sir Joseph Banks and Dr Daniel Solander, naturalists on HM Bark Endeavour during Lieutenant (later Captain) James Cook's 1770 voyage to the Pacific Ocean. A number of arrangements were published in the 1800s, culminating in George Bentham's 1870 arrangement published in Flora Australiensis . [1] This arrangement would stand for over a hundred years, before finally being replaced in 1981 by Alex George's revision, published in his landmark monograph The genus Banksia L.f. (Proteaceae) . [2]

Thiele and Ladiges' arrangement

In 1996, Kevin Thiele and Pauline Ladiges published a cladistic analysis of the genus Banksia in the journal Australian Systematic Botany . [3] As their cladogram differed substantially from the current taxonomic arrangement, they published a revised arrangement that accorded better with their results. Four varieties were promoted to species rank: B. conferta var. penicillata to B. penicillata (now B. conferta subsp. penicillata); B. gardneri var. brevidentata to B. brevidentata; B. gardneri var. hiemalis to B. hiemalis; and B. sphaerocarpa var. dolichostyla to B. dolichostyla. Two new series and elevensubseries were introduced; B. sect. Oncostylis and B. ser. Crocinae were discarded; and B. ser. Cyrtostylis was largely redefined. Six species were left incertae sedis . [3]

Thiele and Ladiges' 1996 taxonomic arrangement of Banksia was as follows:

Banksia
B. subg. Isostylis
B. ilicifolia
B. cuneata
B. oligantha
B. elegans (incertae sedis)
B. subg. Banksia
B. ser. Tetragonae
B. elderiana
B. lemanniana
B. caleyi
B. aculeata
B. ser. Lindleyanae
B. lindleyana
B. ser. Banksia
B. subser. Banksia
B. ornata
B. serrata
B. aemula
B. subser. Cratistylis
B. candolleana
B. sceptrum
B. baxteri
B. speciosa
B. menziesii
B. burdettii
B. victoriae
B. hookeriana
B. prionotes
B. baueri (incertae sedis)
B. lullfitzii (incertae sedis)
B. attenuata (incertae sedis)
B. ashbyi (incertae sedis)
B. coccinea (incertae sedis)
B. ser. Prostratae
B. petiolaris
B. repens
B. chamaephyton
B. blechnifolia
B. hiemalis (now B. gardneri var. hiemalis)
B. gardneri
B. brevidentata (now B. gardneri var. brevidentata)
B. goodii
B. ser. Cyrtostylis
B. pilostylis
B. media
B. epica
B. praemorsa
B. ser. Ochraceae
B. benthamiana
B. audax
B. laevigata
B. laevigata subsp. laevigata
B. laevigata subsp. fuscolutea
B. ser. Grandes
B. grandis
B. solandri
B. ser. Salicinae
B. subser. Acclives
B. oblongifolia
B. plagiocarpa
B. robur
B. dentata
B. subser. Integrifoliae
B. marginata
B. conferta
B. penicillata (now B. conferta subsp. penicillata)
B. paludosa
B. canei
B. saxicola
B. integrifolia
B. integrifolia subsp. integrifolia
B. integrifolia subsp. monticola
B. integrifolia subsp. compar
B. integrifolia subsp. aquilonia (now B. aquilonia )
B. ser. Spicigerae
Banksia subser. Spinulosae
B. spinulosa
B. spinulosa var. spinulosa
B. spinulosa var. collina
B. spinulosa var. cunninghamii
B. spinulosa var. neoanglica
B. subser. Ericifoliae
B. ericifolia
B. ericifolia var. ericifolia
B. ericifolia var. macrantha
B. subser. Occidentales
B. occidentalis
B. brownii
B. seminuda
B. verticillata
B. littoralis
B. ser. Quercinae
B. quercifolia
B. oreophila
B. ser. Dryandroideae
B. dryandroides
B. ser. Abietinae
B. subser. Nutantes
B. nutans
B. nutans var. nutans
B. nutans var. cernuella
B. subser. Sphaerocarpae
B. grossa
B. dolichostyla (now B. sphaerocarpa var. dolichostyla)
B. micrantha
B. sphaerocarpa
B. sphaerocarpa var. sphaerocarpa
B. sphaerocarpa var. caesia
B. subser. Leptophyllae
B. telmatiaea
B. scabrella
B. leptophylla
B. leptophylla var. melletica
B. leptophylla var. leptophylla
B. lanata
B. subser. Longistyles
B. violacea
B. laricina
B. incana
B. tricuspis
B. pulchella
B. meisneri
B. meisneri var. meisneri
B. meisneri var. ascendens

Legacy

In 1999, George published a revised taxonomic arrangement of Banksia as part of the Flora of Australia series of monographs. He stated that "the infrageneric classification and systematic sequence presented here are modified from that of George (1981) and take into account new data revealed in the work of Thiele & Ladiges (1996)". However, Thiele and Ladiges' arrangement was largely rejected. None of the four promotions to species rank was accepted, and none of the thirteen infrageneric taxa introduced by Thiele and Ladiges was retained. [4] However a number of Australian herbaria have continued to follow Thiele and Ladiges on some points, for example by recognising the four species that they promoted. [5]

Related Research Articles

<i>Banksia <span style="font-style:normal;">subg.</span> Banksia</i> Subgenus in the family Proteaceae

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. Within this constraint, however, there have been various circumscriptions.

Taxonomy of <i>Banksia</i> Classification of the plant genus Banksia

As with other flowering plants, the taxonomy of Banksia has traditionally been based on anatomical and morphological properties of the Banksia flower, fruiting structure and seed, along with secondary characteristics such as leaf structure and growth habit. Increasingly, molecular evidence from DNA is providing important new insights into relationships within the genus and between this and other genera in the Proteaceae.

<i>Banksia nutans</i> Species of shrub in the family Proteaceae native to the south coast of Western Australia

Banksia nutans, commonly known as nodding banksia, is a species of shrub native to the south coast of Western Australia in the genus Banksia. Growing to a metre (3 ft) tall, it has pale blue-green fine-leaved foliage and unusual purple-brown inflorescences which hang upside down rather than grow upright like most other banksias.

<i>Banksia <span style="font-style:normal;">ser.</span> Abietinae</i> Series in the genus Banksia

Banksia ser. Abietinae is a valid botanic name for a series of Banksia. First published by Carl Meissner in 1856, the name has had three circumscriptions.

<i>Banksia <span style="font-style:normal;">ser.</span> Salicinae</i> Taxonomic series in the family Proteaceae

Banksia ser. Salicinae is a valid botanic name for a series of Banksia. First published by Carl Meissner in 1856, the name has had three circumscriptions.

The genus <i>Banksia</i> L.f. (Proteaceae) 1981 taxonomic monograph by Alex George

"The genus Banksia L.f. (Proteaceae)" is a 1981 monograph by Alex George on the taxonomy of the plant genus Banksia. Published by the Western Australian Herbarium as Nuytsia3(3), it presented George's taxonomic arrangement of Banksia, the first major taxonomic revision of the genus since George Bentham published his arrangement in Flora Australiensis in 1870.

<i>Banksia <span style="font-style:normal;">ser.</span> Cyrtostylis</i> Taxonomic series in the genus Banksia

Banksia ser. Cyrtostylis is a taxonomic series within the plant genus Banksia. First published at sectional rank by George Bentham in 1870, it was demoted to a series by Alex George in 1981. The name has had three circumscriptions.

<i>Banksia <span style="font-style:normal;">ser.</span> Banksia</i> Autonymous series in the genus Banksia

Banksia ser. Banksia is a valid botanic name for a series of Banksia. As an autonym, it necessarily contains the type species of Banksia, B. serrata. Within this constraint, however, there have been various circumscriptions.

This is a timeline of developments in knowledge and understanding of the Australian plant genus Banksia:

Benthams taxonomic arrangement of Banksia 1870 arrangement of the Australian endemic plant genus Banksia

George Bentham's taxonomic arrangement of Banksia was published in 1870, in Volume 5 of Bentham's Flora Australiensis. A substantial improvement on the previous arrangement, it would stand for over a century. It was eventually replaced by Alex George's 1981 arrangement, published in his classic monograph The genus Banksia L.f. (Proteaceae).

Carl Meissner's taxonomic arrangement of Banksia was published in 1856, as part of his chapter on the Proteaceae in A. P. de Candolle's Prodromus systematis naturalis regni vegetabilis. It was the first attempt to provide an infrageneric classification for the genus, aside from Robert Brown's publication of two subgenera in 1810. Meissner's arrangement stood until 1870, when it was superseded by the arrangement of George Bentham. Meissner's arrangement was an excellent survey of the known species at that time, but his infrageneric taxa were all highly heterogeneous.

Georges taxonomic arrangement of Banksia 1981 and 1996 arrangements of the Australian endemic plant genus Banksia

Alex George's taxonomic arrangement of Banksia was the first modern-day arrangement for that genus. First published in 1981 in the classic monograph The genus Banksia L.f. (Proteaceae), it superseded the arrangement of George Bentham, which had stood for over a hundred years. It was overturned in 1996 by Kevin Thiele and Pauline Ladiges, but restored by George in 1999. A recent publication by Austin Mast and Kevin Thiele suggests that it will soon be overturned again.

<i>Banksia <span style="font-style:normal;">subser.</span> Longistyles</i> Subseries in the family Proteaceae

Banksia subser. Longistyles is a valid botanic name for a subseries of Banksia. It was published by Kevin Thiele in 1996, but discarded by Alex George in 1999.

<i>Banksia <span style="font-style:normal;">subser.</span> Leptophyllae</i> Subseries in the family Proteaceae

Banksia subser. Leptophyllae is a valid botanic name for a subseries of Banksia. It was published by Kevin Thiele in 1996, but discarded by Alex George in 1999.

<i>Banksia <span style="font-style:normal;">subser.</span> Sphaerocarpae</i> Subseries in the family Proteaceae

Banksia subser. Sphaerocarpae is a valid botanic name for a subseries of Banksia. It was published by Kevin Thiele in 1996, but discarded by Alex George in 1999.

<i>Banksia <span style="font-style:normal;">ser.</span> Ochraceae</i> Taxonomic series in the family Proteaceae

Banksia ser. Ochraceae is a valid botanic name for a taxonomic series within the plant genus Banksia. It was published by Kevin Thiele in 1996, but discarded by Alex George in 1999.

<i>Banksia <span style="font-style:normal;">subser.</span> Banksia</i> Subseries in the family Proteaceae

Banksia subser. Banksia is a valid botanic name for a subseries of Banksia. It was first used by Kevin Thiele in 1996, although as an autonym it is not considered to have been published per se. It was discarded by Alex George in 1999.

<i>Banksia <span style="font-style:normal;">subser.</span> Cratistylis</i> Subseries in the family Proteaceae

Banksia subser. Cratistylis is a valid botanic name for a subseries of Banksia. It was first published by Kevin Thiele in 1996 but discarded by Alex George in 1999.

References

  1. Bentham, George (1870). "Banksia". Flora Australiensis . Vol. 5: Myoporineae to Proteaceae. London: L. Reeve & Co. pp. 541–562.
  2. George, Alex S. (1981). "The Genus Banksia L.f. (Proteaceae)". Nuytsia . 3 (3): 239–473.
  3. 1 2 Thiele, Kevin; Ladiges, Pauline Y. (1996). "A Cladistic Analysis of Banksia (Proteaceae)". Australian Systematic Botany . 9 (5): 661–733. doi:10.1071/SB9960661.
  4. George, Alex S. (1999). "Banksia". In Wilson, Annette (ed.). Flora of Australia . Vol. 17B: Proteaceae 3: Hakea to Dryandra. Collingwood, Victoria: CSIRO Publishing / Australian Biological Resources Study. pp. 175–251. ISBN   0-643-06454-0.
  5. Olde, Peter; Neil R. Marriott (2002). "One new Banksia and two new Grevillea species (Proteaceae: Grevilleoideae) from Western Australia" (PDF). Nuytsia . 15 (1): 85–99. Archived from the original (PDF) on 2006-09-23. Retrieved 2007-01-10.