Pleurocoronis
Pleurocoronis is a genus of North American shrubs or subshrubs native to the southwestern United States and northwestern Mexico . 
<triplet> North America <subj> United States <obj> has part <subj> Mexico <obj> has part <triplet> United States <subj> North America <obj> part of <subj> Mexico <obj> shares border with <triplet> Mexico <subj> North America <obj> continent