Summaru. -Habit of twelve )ines of Pt•funia hubrida and threc lincs of Petunia axiflaris, uiolaeea and parodii : the gcnetie differ·cm·es bctwccn lhcsc !ines t!o appcar in the expression of this trait, sorne charactcristil·s of which vary in relation to the endronmental conditions.
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