松杉类植物发生的历史悠久,原始的裸子植物出现于古生代的泥盆纪,经过中生代、新生代,老的相继灭绝,新的不断演化出来,现代的松杉类植物,主要出现于新生代第三纪,经过第四纪冰期,保留下来,繁衍至今。一、湖南杉松类植物的种类我国松杉类植物(指松、杉、柏三科)有23属,160种(包括变种)。我省有16属(占国产属70％),26种(占国产科16％),是个属多种少的地区,和邻接省区比较,属、种较多。现表列如后: 从比较表可知,我省松杉类植物,比同纬度的江西多4属13种,比水热条件丰 The coniferous plant has a long history. The primitive gymnosperms appeared in the Paleozoic Devonian. After the successive Mesozoic, Cenozoic and old extinction, the new constantly evolved. The modern coniferous plants mainly appear in the Cenozoic Tertiary, after the Quaternary ice age, retained, multiply so far. First, the species of cedar pine in China Mycena (including pine, fir, cypress three subjects) are 23 genera and 160 species (including varieties). There are 16 genera in our province (accounting for 70% of domestic products) and 26 species (accounting for 16% of domestic products), which belongs to a large area with few species. Compared with neighboring provinces and autonomous regions, there are more genera and species. Now listed as follows: From the comparison table shows that the coniferous plants in our province than the same latitude Jiangxi more than 4 genera and 13 species, more than the hydrothermal conditions abundance