An organization that I work with is currently developing an extensive kava monograph. As part of the project, I was provided several samples of kava root and rhizome from Vanuatu, to examine and generate a macroscopical description. The cross-section of these specimens conformed to the depiction in photo A. However, I have observed that several purported P. methysticum root/rhizome photos on the internet depict a wagon-wheel type pattern in the cross-section. Are these 'wagon-wheel' types just a different variety of P. methysticum, or are they from a different Piper species mistaken for methysticum? Any insight would be helpful. Thank you.
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