Limestone mountains and species of Gymnosperms in Vietnam

Limestone ecosystem is very sensive and in this ecosystem contain various precious and endangered  species of Gymnosperms. In this paper , 30 species of Gymnosperms belonging to 7 families and 3 classes found in limestone ecosystem in Vietnam are reported: 1. Cycadaceae: Cycas clivicola K.D. Hill, Cycas diannanensis Z.T.Guan & G.D.Tao, Cycas ferruginea F.N.Wei, Cycas miquelii Warb., Cycas multipinnata D.Y. Wang, Cycas taiwaniana Carruth., 4 new species: Cycas brachyantha , Cycas dolichophylla, Cycas hoabinhensis, Cycas tropophylla were identified as new for science (P.K. Loc et al. 2000) (Cycadopsida); 2. Cephalotaceae: Cephalotaxus mannii Hook.f.; 3.Cupressaceae, Cupressus torulosa D.Don, Fokienia hodginsii (Dunn) A.Henry & H.Thomas, 4. Pinaceae: Keteleeria davidiana (Bertrand) Beissn., Keteleeria fortunei (Andr. Murray) Carr., Pinus kwuangtungensis Chun ex Tsiang, Pseudotsuga brevifolia W. C. Cheng & L.K. Fu, Tsuga chinensis (Franch.) Pritz.; 5. Podocarpaceae: Dacrydium elatum (Roxb.) Wall. ex Hook. Nageia fleuryi (Hickel) Laubenf., Nageia wallichiana (Presl) Kuntze, Podocarpus neriifolius D.Don, Podocarpus pilgeri Foxw.; 6. Taxaceae: Amentotaxus hatuyenensis N.T.Hiep , Amentotaxus yunnanensis H.L.Li, Taxus chinensis (Pilg.) Rehd., Taxus wallichiana Zucc. (Pinopsida) and; 7. Gnetaceae: Gnetum latifolium Blume, and Gnetum leptostachyum Blume , Gnetum montanum Markgr. (Gnetopsida).

Nguyen Nghia Thin
College of Science - HNU