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\subsubsection{Sample Preparation}  Before extraction, each plant was cut into roughly 50 pieces. The first plant was cut into forty-six pieces (summarized in the figure below). Because previous data (unpublished) had shown obvious differences between tissue types, our study focused on fine-scale variation within the leaves, roots and rhizomes respectively.  Briefly, leaves were cut into twenty roughly equally-sized pieces (about five centimeters each). The relative position of each piece was recorded. Similarly, rhizomes were sectioned into six segments (between 1.5 and 2 cm in length)