- "Recent developments in taxonomic theory have resulted in the production of classifications of the Flowering Plants that are causing concern to all involved in horticulture — gardeners (both amateur and professional), nurserymen, landscape architects, foresters, designers, conservationists, and journalists, as well as to botanists engaged in many different, non-taxonomic disciplines and to other users of plant names generally" (Brickell et al., 2008:1047).
They certainly are a confused mob as the above mockery demonstrates. One way out of this wet paper bag is to see the world from a evolutionary point-of-view. Artificial classifications, which are useful in identifying plants, for example, are not necessarily evolutionary (in the sense of monophyletic). Some may turn out to be, but only empiricism will provide us with the necessary evidence. That is we need cladistic methods to test taxonomic claims of relatedness (i.e., monophyly). Evidence and empiricism, however, appear to be of no use to Brickell et al.(2008).
- "Cases such as these (and there are more that could be quoted) have arisen from a fundamentalist approach to cladistic methodology, which requires that a classification should not include paraphyletic taxa"(Brickell et al., 2008:1047).
This is because paraphyly is not a phylogenetic problem (phylogenies are essentially monophyletic - don't get confused with genealogies, which have nothing to do with classification). Paraphyly is taxonomic problem that evolutionary taxonomists refuse to face. If a group is paraphyletic, it means it has failed an empirical test for natural grouping. It needs to be revised. Revising groups is what taxonomists do best. Instead of embracing cladistics as a valuable tool, evolutionary taxonomists like Brickell et al. (2008) dismiss it because their favorite taxonomic groups under threat from revision. Acknowledging that one's group is paraphyletic and therefore requiring revision does not make you a bad taxonomist. Keeping non-existent groups however is. I don't want to say that Brickell et al. (2008) are 'bad taxonomists'. They a bunch of misguided evolutionary taxonomists who are confusing different things, namely artificial and natural classifications - an on-going problem since the 18th century. This confusion has led to several 'myths that evolutionary taxonomists live by'. I use Brickell et al. (2008) as an example.
Myth 1: If it ain't broke, don't fix it
One common misconception is that of historical 'significance' or 'pragmatism' in science. For example, 'Reptiles' is a wonderful term and describes all manner of organisms such as fire-breathing dragons, sea serpents and the Sea Devils from Dr. Who. (Remember them?) This does not mean that the Reptilia are immune to scrutiny or empiricism - in fact they're not. The same is true for taxa within the angiosperms
- "We, as horticulturists and horticultural taxonomists, wish to express our strong support for these pragmatic views, which will encourage the retention of familiar and widely used taxa [e.g., Dionysia, Dodecatheon, Soldanella, Omphalogramma, and Cortusa] which are distinctive and historically important" (Brickell et al., 2008:1047).
Myth 2: Taxonomy needs to be 'stable'
There is no such thing as a completely stable classification of living things. This is not because everything is fluid and 'moving' and 'unclassifiable'. As new evidence comes to light (e.g., molecular data), so do new discoveries. But Brickell et al. (2008) beg to differ
- "We are not against taxonomic change, which will continue to be a standard outcome of taxonomic research, but insist that horticulture needs a stable (though not static) classification and nomenclature that can be understood and applied effectively by horticulturists (and others) who exhibit a very wide range of levels of taxonomic sophistication.
Myth 3: The needs of end-users are important
Let's face it, the end users of taxonomy are mostly other taxonomists. Regardless of the descriptions and keys out there, trilobite collectors and purveyors of fossils for instance, still insist on calling any large brimmed harpetid from the Devonian rocks of Morocco Scotoharpes. (The aforementioned genus does not occur in Morocco or in the Devonian). The concerns of end users is quite topical at the moment and will not be discussed in depth here (see Wheeler et al. 2004). The fact of the matter is that end users have to share the burden of changing taxonomies. This may make horticulture and conservation for example harder to do, but many are attempting to reduce this burden through employing new electronic media, which has created new emerging fields such as biodiversity informatics and cybertaxonomy.
Myth 4: Molecular systematists and cladists are all phylocodists
This is a myth that has been exacerbated by Brummitt (2006, 2008). Not all molecular systematists and cladists agree with the phylocode. In fact some of the most ardent critics of the Phylocode are cladists who use molecular data (e.g., see Nixon et al. 2003). Moreover, supporting monophyletic taxa does not automatically make you a Phylocodist or anti-Linnean. Here is an example from (Brickell et al., 2008:1047)
- "(cf. Brummitt in a note to a colleague: ‘By any logical consideration either one has a monophyletic system with an infinite number of nodes but no ranks, for which the PhyloCode is designed, or you have the Linnaean system with ranks at very few levels, and paraphyletic taxa’".
Myth 5: What does the Molecular data mean?
There are many ways to tell someone to p*ss off and this is a beaut:
- "In saying this we do not wish to imply that phylogenetic studies are unimportant or uninteresting; only that the purpose for which they are produced is not applicable to horticultural needs and practices. (Brickell et al., 2008:1047-1048)"
Unfortunately Brickell et al. (2008) do not qualify for this year's Pewter Leprechaun although their attempts at misusing paraphyly have reached a particular zenith.
Brickell, C.D., Crawley, M., Cullen, J., Frodin, D.G., Gardner, M., Grey-Wilson, C., Hillier, J., Knees, S., Lancaster, R., Mathew, B.F., Matthews, V.A., Miller, T., Noltie, H.F., Norton, S., Oakeley, H.J., Richards, J., Woodhead, J. (2008). Do the views of users of taxonomic output count for anything? Taxon 57:1047–1048. Nixon, K. C., J. M. Carpenter, and D. W. Stevenson. 2003. The PhyloCode is fatally flawed, and the "Linnaean" system can easily be fixed. Bot. Rev. 69: 111–120. Wheeler, Q. D., Raven, P. H., Wilson, E. O. 2004. Taxonomy: Impediment or expedient? Science 305: 285.