Definition of orthostichy in English:

orthostichy

nounPlural orthostichies ɔːˈθɒstɪkiôrˈTHästikē

Botany

(in phyllotaxis) a vertical row of leaves arranged one directly above another.
〔植〕（叶序）直列线。与PARASTICHY 相对
Contrasted with parastichy
Example sentencesExamples
- Phyllotactic rows are easiest to identify in columnar cacti because vertically aligned leaf primordia merge together forming ribs (orthostichies).
- On the dorsal surface of the branch there are also two orthostichies of leaves of the usual form.
- Spiral phyllotaxis patterns have only parastichies, whereas whorled patterns have both orthostichies and parastichies.
- Longitudinal section of shoot apex and an orthostichy of leaf primordia that are forming a rib.
- Typically, they traverse the same number of internodes between the position at which they diverge from the minor axial bundles until they enter the branch base as the number of leaf orthostichies on the shoot.

Origin

Late 19th century: from ortho- 'upright, straight' + Greek stikhos 'row, rank'.

Definition of orthostichy in US English:

orthostichy

nounôrˈTHästikē

Botany

(in phyllotaxis) a vertical row of leaves arranged one directly above another.
〔植〕（叶序）直列线。与PARASTICHY 相对
Contrasted with parastichy
Example sentencesExamples
- Spiral phyllotaxis patterns have only parastichies, whereas whorled patterns have both orthostichies and parastichies.
- Phyllotactic rows are easiest to identify in columnar cacti because vertically aligned leaf primordia merge together forming ribs (orthostichies).
- Longitudinal section of shoot apex and an orthostichy of leaf primordia that are forming a rib.
- On the dorsal surface of the branch there are also two orthostichies of leaves of the usual form.
- Typically, they traverse the same number of internodes between the position at which they diverge from the minor axial bundles until they enter the branch base as the number of leaf orthostichies on the shoot.

Origin

Late 19th century: from ortho- ‘upright, straight’ + Greek stikhos ‘row, rank’.

词汇	orthostichy
释义	Definition of orthostichy in English: orthostichy nounPlural orthostichies ɔːˈθɒstɪkiôrˈTHästikē Botany (in phyllotaxis) a vertical row of leaves arranged one directly above another. 〔植〕（叶序）直列线。与PARASTICHY 相对 Contrasted with parastichy Example sentencesExamples Phyllotactic rows are easiest to identify in columnar cacti because vertically aligned leaf primordia merge together forming ribs (orthostichies). On the dorsal surface of the branch there are also two orthostichies of leaves of the usual form. Spiral phyllotaxis patterns have only parastichies, whereas whorled patterns have both orthostichies and parastichies. Longitudinal section of shoot apex and an orthostichy of leaf primordia that are forming a rib. Typically, they traverse the same number of internodes between the position at which they diverge from the minor axial bundles until they enter the branch base as the number of leaf orthostichies on the shoot. Origin Late 19th century: from ortho- 'upright, straight' + Greek stikhos 'row, rank'. Definition of orthostichy in US English: orthostichy nounôrˈTHästikē Botany (in phyllotaxis) a vertical row of leaves arranged one directly above another. 〔植〕（叶序）直列线。与PARASTICHY 相对 Contrasted with parastichy Example sentencesExamples Spiral phyllotaxis patterns have only parastichies, whereas whorled patterns have both orthostichies and parastichies. Phyllotactic rows are easiest to identify in columnar cacti because vertically aligned leaf primordia merge together forming ribs (orthostichies). Longitudinal section of shoot apex and an orthostichy of leaf primordia that are forming a rib. On the dorsal surface of the branch there are also two orthostichies of leaves of the usual form. Typically, they traverse the same number of internodes between the position at which they diverge from the minor axial bundles until they enter the branch base as the number of leaf orthostichies on the shoot. Origin Late 19th century: from ortho- ‘upright, straight’ + Greek stikhos ‘row, rank’.
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