By Terrence Walters, Roy Osborne
Cycads resemble arms, yet are taxonomically particularly diverse. they seem to be a major and irreplaceable portion of the planet's organic variety, having developed numerous and sometimes specific morphological, anatomical and biochemical positive factors in the course of their 250-million-year evolutionary background. Many cycad species exist this day basically as small, poorly-known or remoted populations or as decorative species in botanic gardens. so one can comprehend totally, in addition to to preserve, this the world over endangered tropical plant staff, it really is paramount that cycad systematics are studied, documented and sophisticated. This quantity offers the present kingdom of our wisdom of the systematics of the nearly three hundred species of cycads. It contains contributions from best researchers from Australia, China, Italy, Mexico, South Africa, Thailand and the united states. it's been built from papers provided at a workshop held in 2002, on the Montgomery Botanical middle.
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Extra info for Cycad Classification: Concepts and Recommendations
SSC Cycad Specialist Group, IUCN, Gland, Switzerland and Cambridge, UK, 48–53 pp. qxd 28/11/03 3:43 pm Page 23 Character Evolution, Species Recognition and Classification Concepts in the Cycadaceae 3 Ken D. Hill Royal Botanic Gardens, Sydney, Australia Abstract A number of systems of infrageneric classification of the family Cycadaceae have been presented by different authors. No two systems have been the same in structure or species recognition, and some have been strikingly discordant. Phylogenetic analysis of combined morphological and molecular datasets has yielded a cladogram with good resolution and support on many deeper branches.
B. (1986) Morphological study of the sporophylls of Philippine Cycas. Philippine Journal of Science 115(3), 177–198. A. C. (1963) Cycadaceae. In: Flora of Java, Vol. 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.
Data recorded can then be statistically analysed if required, and groups can be defined. 1). In the Cape York example, the cataphyll characters critical in discriminating taxa had not been previously recorded. It is also of note that these taxa occur in discrete, geographically separated populations. The genus Cycas in general shows a similar geographical replacement pattern throughout its range, often with many closely related entities. Although these taxa are often similar in many respects, the homoplasy evident in the defining characters does not always allow unequivocal aggregation into groups that could be treated as species with subordinate infraspecific taxa.
Cycad Classification: Concepts and Recommendations by Terrence Walters, Roy Osborne