报道了国产14种苋属植物的染色体数目。部分种的染色体数目为2n=34，即反枝苋Amaranthus

  retroflexus，刺苋A．spinosus，红苋A．cruentus，腋花苋A．roxburghianus，合被苋A．polygonoides，皱果苋A．

  viridis，凹头苋A．lividus，苋A．tricolor。其他种的染色体数目为2n=32，即尾穗苋A．caudatus，绿穗苋A．

  hybridus，千穗谷A．hypochendriacus，繁穗苋A．paniculatus，北美苋A．blitoides，白苋A．albus。其中腋花

  苋的染色体数目为首次报道。该属染色体基数为x=16，17。两种染色体基数在苋属2个组(sect．Ama-

  ranthus和sect．Blitopsis)中均存在。由于苋属植物染色体大多为小型染色体，因此对苋属植物目前尚不

In this paper, chromosome numbers of 14 species of the genus Amaranthus from China are reported: A. retroflexus 2n=34, A. caudatus 2n=32, A. hybridus 2n=32, A. spinosus 2n =34, A. cruentus 2n=34, A. hypochendriacus 2n=32, A. paniculdatus 2n=32, A. roxburghianus 2n=34, A. blitoides 2n=32, A. polygonoides 2n=34, A. albus 2n=32, A. viridis 2n = 34, A. lividus 2n = 34, A. tricolor 2n = 34. The number in A. roxburghianus is reported here for the first time. The basic chromosome numbers in this genus are x = 16 and x = 17 and both numbers are found in sect. Amaranthus and sect. Blitopsis. The chromosomes in this genus are very small in size, hampering a detailed karyotype analysis.