a hypothetical spiral line connecting the bases of a series of leaves on a stem
2.
an arrangement of leaves so connected
Compare orthostichy
Derived forms
parastichous (paˈrastichous)
adjective
Word origin
C19: from para-1 + Greek stikhia, from stikhos row, rank
Examples of 'parastichies' in a sentence
parastichies
In these latter cases the parastichies themselves disappear.
Yves Couder 2014, 'Initial transitions, order and disorder in phyllotactic patterns: the ontogeny ofHelianthus annuus: a case study', Acta Societatis Botanicorum Poloniaehttps://pbsociety.org.pl/journals/index.php/asbp/article/view/824. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
More parastichies appear only when phyllotaxis changes from one whorled pattern toanother.
Dorota Kwiatkowska, Joanna Florek-Marwitz 2014, 'Ontogenetic variation of phyllotaxis and apex geometry in vegetative shoots of Sedummaximum (L.) Hoffm.', Acta Societatis Botanicorum Poloniaehttps://pbsociety.org.pl/journals/index.php/asbp/article/view/756. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Our investigation on phyllotactic patterns reveals a high tendency (30%) of the head meristem to insert or lose parastichies.
Somayeh Naghiloo, Regine Claßen-Bockhoff 2017, 'Understanding the unique flowering sequence in Dipsacus fullonum: Evidence from geometricalchanges during head development.', PLoS ONEhttp://europepmc.org/articles/PMC5362205?pdf=render. Retrieved from PLOS CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Dependent on the spatio-temporal relation between meristem expansion and primordia initiation, either flower primordia are promoted or additional parastichies appear.
Somayeh Naghiloo, Regine Claßen-Bockhoff 2017, 'Understanding the unique flowering sequence in Dipsacus fullonum: Evidence from geometricalchanges during head development.', PLoS ONEhttp://europepmc.org/articles/PMC5362205?pdf=render. Retrieved from PLOS CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)