By Terrence Walters, Roy Osborne
Cycads resemble arms, yet are taxonomically fairly various. they're a major and irreplaceable part of the planet's organic variety, having advanced numerous and sometimes certain morphological, anatomical and biochemical beneficial properties in the course of their 250-million-year evolutionary historical past. Many cycad species exist this day in basic terms as small, poorly-known or remoted populations or as decorative species in botanic gardens. in an effort to comprehend totally, in addition to to preserve, this across the world endangered tropical plant crew, 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 contains contributions from major 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 heart.
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Additional resources for Cycad Classification:
Revoluta C. panzihuaensis C. changjiangensis C. guizhouensis C. sexseminifera C. bifida C. diannanensis C. pectinata C. clivicola C. lindstromii C. pranburiensis C. condaoensis C. siamensis C. inermis C. scratchleyana C. beddomei C. circinalis C. spherica C. riuminiana C. thouarsii C. rumphii C. micronesica C. bougainvilleana C. seemannii C. apoa C. tuckeri C. yorkiana C. cairnsiana C. ophiolitica C. maconochiei C. calcicola C. furfuracea C. silvestris C. media C. papuana C. armstrongii Fig. 1.
1959) The families of cycads and the Zamiaceae of Australia. Proceedings of the Linnaean Society of New South Wales 84, 64–117. W. (1843) Genera et species Cycadearum viventium. Linnaea 17, 675–744. W. (1861) Prodromus Systematis Cycadearum. Van der Post, Utrecht, Holland, 35 pp. W. (1874) Fragmenta Phytographie Australiae, Vol. 8. Government Printer, Melbourne, Australia, 304 pp. Pilger, R. (1926) Cycadaceae. In: Engler, A. ) Die Naturlichen Pflanzenfamilien, 2nd edn 2, 13, pp. 44–82. Schuster, J.
1991) What to protect? Systematics and the agony of choice. Biological Conservation 55, 235–254. S. J. (eds) (1998) 1997 IUCN Red List of Threatened Plants. Compiled by the World Conservation Monitoring Centre, IUCN, Gland, Switzerland and Cambridge, UK, 862 pp. Walters, T. (2003) Off-site collections. S. ) Cycads. Status Survey and Conservation Action Plan. 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.
Cycad Classification: by Terrence Walters, Roy Osborne