parastichyn.

Brit.

/pəˈrastᵻki/, U.S.

/pəˈræstəki/

Origin: A borrowing from Greek, combined with English elements; modelled on a German lexical item. Etymons: para- prefix¹, Greek στίχος , -y suffix³.

Etymology: < para- prefix¹ + ancient Greek στίχος row, line (see stich n.) + -y suffix³, after German Parastichen, plural (1873 in the passage translated in quot. 1875). Compare orthostichy n.

Botany.

A secondary spiral or series of members (leaves, scales, etc.) around an axis in a closely spaced spiral phyllotaxis.

ΘΚΠ

the world > plants > part of plant > (defined by) distribution, arrangement, or position > [noun] > orthostichy or parastichy

superposition1830

strophe1846

orthostichy1875

parastichy1875

1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. i. iii. 173 When the members of a spiral phyllotaxis with a constant angle of divergence stand sufficiently close to one another, spiral arrangements are easily seen and followed to the right and left which more or less conceal the genetic spiral. These rows are called Parastichies, and are particularly clear in the cones of species of Pinus.

1884 F. O. Bower & D. H. Scott tr. H. A. de Bary Compar. Anat. Phanerogams & Ferns 285 Two bundles..come into contact—that from the one side following the parastichies composed of every third leaf, that from the other the parastichies composed of every fifth leaf.

1929 New Phytologist 28 41 The phyllotaxis of Lupinus albus is a spiral system with 3 + 5 parastichies.

1992 M. Ingrouille Diversity & Evol. Land Plants 50 The angle between the primordia in the parastichy approximates to 137.5°, the so called golden section or Fibonacci angle.

This entry has been updated (OED Third Edition, June 2005; most recently modified version published online March 2022).

单词	parastichy
释义	parastichyn. Brit. /pəˈrastᵻki/, U.S. /pəˈræstəki/ Origin: A borrowing from Greek, combined with English elements; modelled on a German lexical item. Etymons: para- prefix¹, Greek στίχος , -y suffix³. Etymology: < para- prefix¹ + ancient Greek στίχος row, line (see stich n.) + -y suffix³, after German Parastichen, plural (1873 in the passage translated in quot. 1875). Compare orthostichy n. Botany. A secondary spiral or series of members (leaves, scales, etc.) around an axis in a closely spaced spiral phyllotaxis. ΘΚΠ the world > plants > part of plant > (defined by) distribution, arrangement, or position > [noun] > orthostichy or parastichy superposition1830 strophe1846 orthostichy1875 parastichy1875 1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. i. iii. 173 When the members of a spiral phyllotaxis with a constant angle of divergence stand sufficiently close to one another, spiral arrangements are easily seen and followed to the right and left which more or less conceal the genetic spiral. These rows are called Parastichies, and are particularly clear in the cones of species of Pinus. 1884 F. O. Bower & D. H. Scott tr. H. A. de Bary Compar. Anat. Phanerogams & Ferns 285 Two bundles..come into contact—that from the one side following the parastichies composed of every third leaf, that from the other the parastichies composed of every fifth leaf. 1929 New Phytologist 28 41 The phyllotaxis of Lupinus albus is a spiral system with 3 + 5 parastichies. 1992 M. Ingrouille Diversity & Evol. Land Plants 50 The angle between the primordia in the parastichy approximates to 137.5°, the so called golden section or Fibonacci angle. This entry has been updated (OED Third Edition, June 2005; most recently modified version published online March 2022). < n.1875
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