Definition of parastichy in English:
parastichy
nounPlural parastichies pəˈrastɪkipəˈrastəkē
Botany (in phyllotaxis) an oblique row of leaves arranged in a secondary spiral.
Contrasted with orthostichy
Example sentencesExamples
- Curved lines show parastichies between stamens and last-formed tepals.
- There was a negative correlation between phyllotaxy and leaf primordium diameter: species with greater numbers of orthostichies or parastichies had smaller leaf primordia.
- Pistillate flowers, sterile male flowers, atypical bisexual flowers and staminate flowers are inserted on the same contact parastichies.
- However, in Jean's model it is not possible to determine the entropy of the phyllotactic system without knowing the number of visible opposed parastichies (m, n).
Origin
Late 19th century: from para-1 'adjacent' + Greek stikhos 'row, rank'.