Stem (with prickles), petiole, and withered stipular tendrils (at base of petiole)  
  Part of: Howell N, Krings A, Braham R (2016) Guide to the littoral zone vascular flora of Carolina bay lakes (U.S.A.). Biodiversity Data Journal 4: e7964. https://doi.org/10.3897/BDJ.4.e7964