| 释义 |
parastichy Bot.|pəˈræstɪkɪ|
[f. para-1 1 + Gr. -στιχία, from στίχ-ος row, rank: cf. orthostichy.]
A secondary spiral or oblique rank of lateral members, as leaves or scales, around the stem or axis, in a phyllotaxis in which the leaves, scales, etc. are close together, as in certain leaf-rosettes, pine-cones, etc.
1875Bennett & Dyer tr. Sachs' 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. 1884Bower & Scott De Bary's Phaner. 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. |