Abstract
The genusCycas is revised for Thailand. Ten species are enumerated, five of them described as new (C. chamaoensis, C. clivicola, C. litoralis, C. nongnoochiae, C. tansachana), with one new subspecies (C. clivicola subsp.lutea). The species are placed within an infrageneric classification previously outlined. Distributions of the taxa are mapped, eight of the species are illustrated, and a key to species is provided. Previous records ofC. circinalis andC. rumphii from Thailand (here not regarded as indigenous in Thailand) are discussed.
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Literature Cited
Cheng, W. C., L. K. Fu &C. Y. Cheng. 1975. Gymnospermae Sinicae. Acta Phytotax. Sin. 13: 81–82.
Craib, W. G. 1912. Contributions to the flora of Siam II. Kew Bull. Mise. Inform. 1912: 434–435.
De Candolle, A. P. 1868. Cycadaceae.In: A. P. De Candolle, editor. Prodr. Syst. Nat. & Reg. Veg. 16: 522–548.
Dehgan, B. &C. K. H. Yuen. 1983. Seed morphology in relation to dispersal, evolution and propagation ofCycas. Bot. Gaz. 144: 412–418.
Fosberg, F. R. &M.-H. Sachet. 1975. Flora of Micronesia. Part 1. Gymnospermae. Smithsonian Contrib. Bot. 20: 1–5.
Greuter, W., editor. 1994. International code of botanical nomenclature (Tokyo Code). Koeltz. Königstein.
Hiep, N. T. &J. E. Vidal. 1996. Gymnospermae. Flora du Cambodge, Laos et Vietnam 28. Muscu National Histoire Naturelle, Paris.
Hill, K. D. 1994. TheCycas rumphii Complex (Cycadaceae) in New Guinea and the Western Pacific Austral. Syst. Bot. 7: 3–567.
— 1995a. The genusCycas (Cycadacae) in the Indian region, with notes on the application and typification of the nameCycas circinalis L. Taxon 44: 23–31.
— 1995a. The rediscovery ofCycas macrocarpa. Palms & Cycads 46: 18–23.
— 1995c. Infrageneric relationships, phylogeny and biogeography of the genusCycas (Cycadaceae). Pages 139–162.In: P. Vorster, editor. CYCAD 93, 3rd International Conference on Cycad Biology, Proceedings. Cycad Society of South Africa, Stellenbosch.
Holttum R. E.. 1953.Cycas in Malaysia. Malayan Nat. J. 8: 1–3.
IUCN. 1994. IUCN Red List Categories. IUCN. Cland, Switzerland.
Jarvis, C. E., F. R. Barrie, D. M. Allan &J. L. Reveal. 1993. A list of Linnaean generic names and their types. Regnum Veg. 127: 1–100.
Leandri, J. 1931. Cycadacées. Pages 1085–1092.In: M. H. Lecomte & F. Gagnepain, editors. Fl. Gen. Indo-Chine, 5. Parris.
Miquel, F. A. W. 1863. Bot.. Zeitung (Berlin) 21: 334.
Ostenfeld, C. H. 1904. Cycadaceae.In: F. Schmidt. editor. Flora of Ko Chang. Bot. Tidsskr. 26: 162.
Pilger, R. 1926. Cycadaceae. Pages 44–82.In: A. Engler, editor, Die naturlichen Pflanzenfamilien. Vol. 13. Ed. 2.
Ridley, H. 1925. Cycadaceae. Flora of the Malay Peninsula 5: 283–285.
Schuster, J. 1932. Cycadaceae.In: A. Engler, editor. Das Pflanzenreich 99 (4,1): 1–168.
Smitinand, T.. 1971. The genusCycas Linn. (Cycadaceae) in Thailand. Nat. Hist. Bull. Siam Soc. 24, 163–175.
Smitinand, T. 1972. Cycadaceae.In: T. Smitinand & K. Larsen, editors. Flora of Thailand 2(2): 185–192.
Stevenson, D. W. 1981. Observations on ptyxis, phenology and trichomes in the Cycadales and their systematic implications. Amer. J. Bot. 68: 1104–1114.
— 1992. A formal classification of the extant cycads. Brittonia 44: 220–223.
Suvatabandhu, K. 1961. The living gymnosperms of Thailand. J. Nat. Res. Council Thailand 2: 59–62.
Wang, D. Y. 1996. Systematic classification and taxonomy. Pages 9–142.In: F.-X. Wang & H.-B. Liang, editors. Cycads in China. Guangdong Science and Technology Press, Guangdong.
Zhou, L., S. Y. Yang &Z. Zhou. 1990. Investigation of the natural community ofCycas panzihuaensis L. Zhou & S. Y. Yang. Mem. New York Bot. Gard. 57: 148–151.
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Hill, K.D., Yang, SL. The genus Cycas (Cycadaceae) in Thailand. Brittonia 51, 48–73 (1999). https://doi.org/10.2307/2666557
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DOI: https://doi.org/10.2307/2666557