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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Morphological indexes of Verbena under drought stress. T01 is the control group and T02 is the drought experiment group: (a) The determination of stem length; (b) The determination of root length.