One of the mysteries of the English language finally explained.
(in phyllotaxis) an oblique row of leaves arranged in a secondary spiral.Contrasted with orthostichy
- ‘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).’
- ‘Curved lines show parastichies between stamens and last-formed tepals.’
- ‘Pistillate flowers, sterile male flowers, atypical bisexual flowers and staminate flowers are inserted on the same contact parastichies.’
- ‘There was a negative correlation between phyllotaxy and leaf primordium diameter: species with greater numbers of orthostichies or parastichies had smaller leaf primordia.’
Late 19th century: from para- ‘adjacent’ + Greek stikhos ‘row, rank’.
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