对海南岛13种菊科植物进行了染色体研究,对其中9种植物进行了核型分析,结果为:树菊Tithonia diversifolia A. Gray, 2n=34=26m+8sm (2sat); 鳢肠Eclipta prostrata (L.) L., 2n=22=18m+4sm;金腰箭Synedrella nodiflora (L.) Gaertn., 2n=40=6m+30sm (2sat)+4st;三叶鬼针草黄花类型Bidens pilosa L. (yellow flower), 2n=72=46m+26sm (2sat);羽芒菊Tridax procumbens L., 2n=36=8m+22sm (2sat)+6st;飞机草Eupatorium odoratum L., 2n=60=46m+14sm (2sat);一点红Emilia sonchifolia (L.) DC., 2n=20=4m+14sm+2st (1sat);夜香牛Vernonia cinerea (L.) Less., 2n=18=18m (4sat);白花地胆草Elephantopus tomentosus L., 2n=22=22m (4sat).另外4个种的染色体数目为:革命菜Gynura crepidioides Benth.、霍香蓟Ageratum conyzoides L., 2n=40;银胶菊Parthenium hysterophorus L., 2n=34;蟛蜞菊Wedelia chinensis (Osbeck.) Merr., 2n=56.三叶鬼针草白花类型Bidens pilosa L. (white flower)的染色体数目为2n=72.
菊科 野生种 染色体数目 核型