Abstract
The genus Helianthus is a comparatively large one, containing, according to Watson (13), 108 authentic and several doubtful species. These are arranged and classified by the taxonomist according to manifestations that are readily visible, but, if the chromosome number and the behavior during meiosis were known in each case, a better understanding could be gained of the interrelation of the species and greater accuracy might be possible in deciding whether a doubtful plant were a variety, a true species or a hybrid.
COinS
