By Terrence Walters, Roy Osborne
Cycads resemble hands, yet are taxonomically relatively varied. they seem to be a major and irreplaceable part of the planet's organic variety, having advanced a number of and infrequently distinctive morphological, anatomical and biochemical gains in the course of their 250-million-year evolutionary historical past. Many cycad species exist at the present time merely as small, poorly-known or remoted populations or as decorative species in botanic gardens. on the way to comprehend totally, in addition to to preserve, this across the world endangered tropical plant workforce, it truly is paramount that cycad systematics is studied, documented and refined.This quantity provides the present kingdom of our wisdom of the systematics of the nearly three hundred species of cycads. It comprises contributions from top researchers from Australia, China, Italy, Mexico, South Africa, Thailand and the united states. it's been constructed from papers offered at a workshop held in 2002 on the Montgomery Botanical heart.
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Additional info for Cycad Classification:
1. Noordhoff, Groningen, The Netherlands, p. 87. Carruthers, W. (1893) On Cycas taiwaniana sp. nov. and C. Br. Journal of Botany 31, 1–3; t. 330–331. Y. X. (1998) Acta Sci. Nat. Univ. Sunyatseni 37, 8. J. W. (1999) Cycadaceae. Y. H. (eds) Flora of China, Vol. 4, Cycadaceae through Fagaceae. Science Press, Beijing and Missouri Botanical Garden Press, St Louis, Missouri, pp. 1–7. P. (1868) Cycadeae. In: Prodromus Systema Natura and Regnum Vegetabile 16(2). Victor Massen, Paris, pp. 361–521. J. and Adema, F.
The results of this analysis show that cycad taxonomists need to develop consistent and widely accepted concepts for infrageneric taxa to reduce the influence of taxonomic uncertainty on the Red Listing process. Introduction Ongoing assessment of the threatened status of the world’s cycad flora (Red Listing) is an essential process for conservation planning and actions (Osborne, ©CAB International 2004. Cycad Classification: Concepts and Recommendations (eds T. Walters and R. qxd 28/11/03 14 3:42 pm Page 14 J.
Rumphii polyphyletic. , 2000). Hence section Lemuricae should correctly be section Cycas and subsection Pandemicae should be subsection Cycas. In summary, Schuster recognized five infrageneric taxa, three of which are shown to be polyphyletic (Fig. 4A). Only four infrageneric groups are marked on Fig. 4A. One of the marked groups (Endemicae) is monophyletic, while the other is monotypic (and thus monophyletic by definition). ) then it might be said that it is poly- and not paraphyletic. Similarly, Pandemicae would be most appropriately described as polyphyletic.