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.
Influence de la feuille axillante sur la polarité primaire de son bourgeon. Observations préliminaires P\H 1\I.UUE-FRA:-./CE TURLIEH, ANDHÉ BRUNAUD ET FRANÇOIS BUGNON Lubor(ltoire de Botanique, Faculté des Sciences, 21 -Dijon.Résumé. -Pour tenter de formuler une hypoth(•sc de travail sur l'inlluencc exercée par une feuille sur l'emplacement des préfeuilles de son hourgpon axillaire, les auteurs étudknt quelques cas spontanés de bourgeons axillés par une feuille dédoublée. La feuille pourrait manifester son inllucnce suivant une direction rayonnant à partir de son plan médian.
Summary. -In order to try to formulatc a working hypothesis t·oncer-ning the inllucnce produccd by a leaf on the localisation of the prophylls of its axillary bud, the authors investigatc somc spontaneous cases of buds suhtt•rHI<>d by a double leaf. The leaf m ight re\·t·a 1 its in tl ut• liee a long a tlirection radiating from its median plane.
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