orthostichousadj.

1880 A. Gray Struct. Bot. Orthostichous, straight-ranked.

1951 Philos. Trans. (Royal Soc.) B. 235 514 The series of leaves obtained by selecting, for instance, every thirteenth along the genetic spiral..will approach, though not in general precisely realize, the condition described as orthostichous, i.e. the fourteenth leaf will be nearly superimposed longitudinally over the first.

1993 Internat. Jrnl. Plant Sci. 154 256/2 The current model involving multiple lateral OCs [organizing centres] in the helical or whorled orthostichous phyllotaxis produces striking correspondence with actual steles of the latter group in xylem ribbing and variable expression of internal phloem.