Centre of Forest Seed-Growing, Nadsonovskaya ul., 13, Pushkino, Moscow region 141200, Russia

Abstract

The author investigates theoretical variants of spiral phyllotaxis using structural coefficient - the distance between consequent members in genetic spiral, expressed in parts of circle. The meanings of structural coefficient in which parastichies change their isomery are determined as critical points. The author describes the overlapping of parastichies of lower lane by higher lane parastichies and presents the methods of overlapping determination. Parastichies with minimal distance between members in lane are clearly determined on shoots. Methods and formulas for calculation of structural coefficient using the number of members in parastichy circle are presented. Ortostichy is considered as a special case of parastichy location. Ortostichies are equal to parastichies in maximal critical points.