Plants grown up from seeds collected in the wild were cultivated in the experimental garden. These plants were investigated cytologically and morphologically. They turned out to be tetraploids with 2n =44 chromosomes. This is the same number as reported by Fagerlind (1937) in material from unknown origin and by van Loon (1974) in plants from Lanzarote, the Canaries. The metaphase-plates of roottip mitosis have a regular pattern, but some difference in length of the chromosomes can be observed. B-chromosomes or satellites are not present (fig. 10.5).