The genus Cycas (Cycadaceae) in Thailand

Hill, K. D. (National Herbarium of New South Wales, Royal Botanic Gardens, Mrs Macquaries Road, Sydney 2000, Australia) & S.-L. Yang (Fairchild Tropic al Garden, 11935 Old Cutler Road, Miami, FL 33156, U.S.A.). The genus Cycas (Cycadaceae) in Thailand. Brittonia 51: 48-73. 1999.-The genus Cycas is re vised for Thailand. Ten species are enumerated, five of them described as n ew (C. chamaoensis, C. clivicola, C, litoralis, C, nongnoochiae, C, tansach ana), with one new subspecies (C, clivicola subsp. lutea). The species are placed within an infrageneric classification previously outlined. Distribut ions of the taxa are mapped, eight of the species are illustrated, and a ke y to species is provided. Previous records of C. circinalis and C. rumphii from Thailand (here not regarded as indigenous in Thailand) are discussed.