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The phrase 'upper leaves' is correct and can be used in written English.
It is a term used to refer to the leaves at the top of a plant. For example, "The upper leaves of the tree had begun to turn gold in the autumn sun."
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Its leaves are smooth, bluish green, and deeply scalloped, and the bases of the upper leaves clasp the stem.
For a comfortable ride, the supple upper leaves support the vehicle when unloaded -- think of Big Daddy Contractor driving to the job site.
The stems of many species are covered with prickles; the lower leaves are scalelike; and the leathery upper leaves have untoothed blades with three to nine large veins.
Musk mallow also refers to Malva moschata, a perennial European plant with pink or white flowers, deeply cut upper leaves, and kidney-shaped basal leaves.
Upper leaves sessile, bract-like, linear.
Samples from both lower and upper leaves were collected.
Curling of the leaves and leaf chlorosis were observed only in the upper leaves of B-deficient plants.
Movement (A) from left to right; (B) from right to left; (C) from base to terminal; (D) from terminal to base; (E) from lower leaves to upper leaves; (F) from upper leaves to lower leaves.
Fe stored in the flag and upper leaves may be transported to the grains via the phloem.
The tips of lower leaves of normal plants sometimes yellowed also, but the tips of upper leaves remained green.
When compared with the lower half-exposed and shade-leaves, the upper leaves of E. angustifolia have a greater areole density, a higher mesophyll proportion and stomatal density.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com