These lines can even have different chromosome numbers (or ploidy levels), making them less compatible with other plants even when cross-pollination does occur. A full list of synonyms, subspecies and varieties is given in the Brassicaceae Species Checklist. The account here is for Draba verna L. in its original, aggregate, sense, although D. praecox and D. majuscula can be viewed as separate species.
Different chromosome numbers (or ploidy levels) within these lines can make them incompatible with other plants even when cross-pollination happens. A full list of synonyms, subspecies, and varieties is available in the Brassicaceae Species Checklist. This account focuses on Draba verna L., but D. praecox and D. majuscula could be considered separate species.