A new cytological technique has been developed which makes it possible to study the meiosis, both in micro- and megasporogenesis, of Rubus arcticus L., R. stellatus Sm. and their hybrids in more detail than before, especially the prophase. In the prophase, a bouquet is observed. Its formation begins in the leptotene, when the telomeres gather in a restricted area and the heterochromatic centromere regions form a kind of chromocenter. In the zygotene there is a synizesis, i.e. a form of bouquet, whereas, in the pachytene, the chromosomes are paired and the bouquet is at its height. After the pachytene “schizonema” is observed, the phase where homologous chromosomes begin to separate forming a starlike figure, and chiasmata are not seen. The chromocenter is still extant, but it breaks in the diplotene, and the chiasmata become visible. Subsequently, the meiosis proceeds as usual. Only two of the hybrid individuals displayed any disturbances. The pachytene bivalents are divided into three groups: one nucleolus-organising bivalent, three subacrocentric and three submetacentric bivalents. The same groups are obtained when the meiotic chromosomes are grouped.