By Terrence Walters, Roy Osborne
Cycads resemble arms, yet are taxonomically relatively various. they seem to be a major and irreplaceable element of the planet's organic range, having advanced numerous and sometimes special morphological, anatomical and biochemical gains in the course of their 250-million-year evolutionary historical past. Many cycad species exist this present day simply as small, poorly-known or remoted populations or as decorative species in botanic gardens. so as to comprehend totally, in addition to to preserve, this across the world endangered tropical plant staff, it's paramount that cycad systematics are studied, documented and subtle. This quantity offers the present kingdom of our wisdom of the systematics of the nearly three hundred species of cycads. It contains contributions from prime researchers from Australia, China, Italy, Mexico, South Africa, Thailand and america. it's been constructed from papers offered at a workshop held in 2002, on the Montgomery Botanical heart.
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Extra resources for Cycad Classification: Concepts and Recommendations
Of the four infrageneric taxa recognized by Smitinand, three are shown to be polyphyletic (Fig. 4B). Dehgan and Dehgan (1988) alluded to an infrageneric classification and published a series of names with a major division based on presence or absence of spongy tissue in seeds and incorporating differences in pollen structure (Fig. 4C). This classification was not formally published, and neither the requirement for autonyms nor the rule of priority was followed. Although the character basis for this subdivision was sound, incorrect identifications and a lack of understanding of specific limits made the arrangement untenable.
W. , 2003) and represents the second most threatened genus within the Cycadales [after Microcycas 3:42 pm Page 20 20 Za mi a Za mi a Ma cro za mi a Ma cro za mi a En ce ph ala r to s En ce ph ala r to s Dio on s ca Cy s ca Cy Ce rat oz am ia J. qxd Fig. 4. Changes in recognized cycad taxa between different Red List assessments, from Gilbert (1984) to Osborne (1995), from 1995 to the 1997 IUCN Red List of Threatened Plants (Walter and Gillett, 1998), and from 1997 to 2002 (Donaldson, 2003). (A) The number of taxa listed on the first date but not recognized as valid taxa when the next list was published.
Cycadaceae) in Thailand. Natural History Bulletin of the Siam Society 24, 163–175. W. (1992) A formal classification of the extant cycads. Brittonia 44, 220–223. Y. (1996) Systematic classification and brief introduction to Cycadales (Chapter 2) and Taxonomy of Cycas in China (Chapter 3). X. B. (eds) Cycads in China. Guangdong Science and Technology Press, Guangdong, China, pp. 9–142. Warburg, O. (1900) Cycadaceae. In: Warburg, O. ) Monsunia. Engelmann, Leipzig, Germany, pp. 178–181. N. (1994) A new cycad from Guangxi.