Thirty - nine pantropic families account for 44 . 83 % of the total families , while 114 north temperate genera amount to 23 . 55 % of the total genera 有39科种子植物属于泛热带分布类型，占总科数的44 . 83 % ； 114属为北温带分布类型，占总属数的23 . 55 % 。
2.
In generic geographic composition , the proportions of pantropic distribution and tropic asia to tropic africa distribution are relatively increased , however , tropic asia distribution is relatively decreased 在属的地理成分上，片断森林中全热带分布和热带亚洲至热带非洲分布成分比例相对增高，而热带亚洲成分相对减少。
3.
In this paper , the basic characteristics of neilingding island ? s flora and their relationships with the neighboring floras were studied . the results show : ( 1 ) the vascular flora of neilingding island consists of 127 families , 367 genera and 551 species , of which 38 species of 25 genera and 20 families belongs to pteridophyta ; ( 2 ) the typical families of seed flora are lauraceae , rubiaceae , apocynaceae , annonaceae , euphorbiaceae , moraceae , aquifoliaceae , rutaceae , araliaceae , myrsinaceae , urticaceae , menispermaceae , araceae , palmae , etc . most of them also are the basic elements of cathaysian flora ; ( 3 ) 342 genera of seed plants in neilingding island can be classified to 13 types according to wu zheng - yi ? s " areal types of chinese genera of seed plant " ; the dominant geographical elements are pantropic genera ( 36 . 05 % ) , old world tropic ( 12 . 54 % ) , tropical asia ( 11 . 60 % ) , the total tropical elements made up to 84 . 90 % of the total number of genera , but the typical and specialized tropical elements are scanty . most of them mainly distributes to sub - tropic or even to temperate zone ; ( 4 ) comparing the floristic composition of neilingding island with those of the neighboring regions , they is closely related to the flora of hong kong which is situated to the east of neilingding island . they all are belonged to the south china province of cathaysian kingdom 通过对广东内伶仃岛的维管植物区系进行全面考察、采集、鉴定和研究,结果表明: ( 1 )共有野生维管植物127科367属551种,其中蕨类植物20科25属38种,种子植物107科342属513种, 12种为广东新记录; ( 2 )种子植物区系的表征科主要有:樟科、茜草科、夹竹桃科、番荔枝科、大戟科、桑科、冬青科、芸香科、葡萄科、五加科、紫金牛科、荨麻科、防己科、天南星科、棕榈科等; ( 3 )属的地理成分以泛热带分布为主,其次为旧世界热带及东亚分布; ( 3 )通过与邻近地区植物区系的比较,发现内伶仃岛与香港植物区系相似性最高,与古田、古兜山的相似性次之,而与南昆山的相似性较低,它们均属于华夏植物区系界的华南省。
