Photo: Castela emoryi 4.

Closeup of butchered branch. This is -not- how you pick the plant. Pipeline road, AZ, US. Wild. 1998-03-01.
Castela emoryi (Gray) Moran & Felger Engl.: crucifixion thorn, cascara amarga, chaparro amargosa. Span.: corona de cristo. Bot. syn.: Holacantha emoryi Gray
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Photo: Castela emoryi 4.