Abstract: The floristic analysis of wild vascular plants in Chenhedong Nature Reserve, Guangdong Province was studied on the basic of field investigation. The results showed that: (1) There were 1139 wild vascular plant species including varieties and forma, belonging to 627 genera in 193 families. Specifically, there were 119 species of pteridophytes, 9 species of gymnosperms, 1011 species of angiosperms (838 species of dicotyledon belonging to 417 genera, 130 families and 173 species of monocotyledon belonging to 111 genera, 20 families), belonging to 8 genera in 7 families, 66 genera in 36 families and 528 genera in 150 families respectively. (2) The dominant phenomenon in family and genus of plants was significant. The dominant families of seed plants were Asteraceae, Poaceae and Rubiaceae. The composition of the seed plants in this region was highly dispersed and complex. In the composition of families and genera, the main species were oligospecies with the proportion of 67.88% and 91.7% respectively. (3) The composition of pteridophytes in genera was also dispersive. The majority of genera included less than five species in pteridophytes, accounting for 93.94%. (4) The flora of vascular plants in this region was complex. At family level, there were 8 distribution types and 5 variety-types of seed plants. The proportion of the tropical distribution reached 50.96%, which contained 80 families. There were 5 distribution types of pteridophyte. The tropical components included 23 families, which accounted for 63.89%. At genus level, there were 13 distribution types and 16 variety-types of seed plants. The tropical components were 68.10%, comprising 365 genera. The pteridophytes belonged to 7 distribution types and 1 variety-types and the proportion of the tropical distribution was 60.61%, containing 40 genera.

Key words: Chenhedong Nature Reserve, seed plant, pteridophyte, flora

摘要： 在野外调查及查阅相关资料的基础上，对广东从化陈禾洞省级自然保护区植物区系进行研究。结果表明：(1) 该区植物资源丰富，共有野生维管植物193科627属1139种(包括种下等级)。其中，蕨类植物36科66属119种，裸子植物7科8属9种，被子植物150科528属1011种(双子叶植物130科417属838种，单子叶植物20科111属173种)。(2) 该区种子植物科、属优势现象明显，以菊科Asteraceae、禾本科Poaceae及茜草科Rubiaceae为主。在科属的组成上较为分散，主要以少寡种的科、属为主，分别占67.88%、91.7%。(3) 该区蕨类植物在属的组成上也较为分散，以5个种以下的属为主，占比为93.94%。(4) 该区植物区系成分复杂，在科级水平上，种子植物有8个分布区类型及5个变型，热带分布类型成分有80个科，占总科数的50.96%，而蕨类植物有5个分布区类型，热带成分的科有23个，占蕨类总科数的63.89%；在属级水平上，种子植物有13个分布区类型及16个变型，热带成分有365属，占总属数的68.10%，而蕨类植物有7个类型及1个变型，热带分布类型成分有40属，占蕨类植物总属数的60.61%。

关键词: 陈禾洞自然保护区, 种子植物, 蕨类, 植物区系