Relationships among 17 isolates from the bean yellow mosaic potyvirus subgroup were investigated by molecular hybridization, using randomly primed complementary DNA to each of the isolate-RNA''s, and by direct enzyme-linked immunosorbent assay, using antisera to five of the isolates. The same general pattern of relationships among isolates was found by both methods. Six clover yellow vein virus (CYVV) isolates from Australia appeared to be related to a North American isolate, CYVV-Pratt, though they were more closely related to each other. Relationships among seven bean yellow mosaic virus (BYMV) isolates from Australia were more diverse, with some isolates appearing closely related to a North American isolate, BYMV-Scott. None of the Australian isolates, including pea mosaic virus 1, were closely related to the North American pea mosaic virus (BYMV)-204-1. The Australian sweet pea mosaic virus was not closely related to BYMV, CYVV, or pea mosaic virus.