Premise: Croton lechleri is a species of flowering plant in the spurge family, Euphorbiaceae, that is native to northwestern South America. It is commonly known as Sangre de Grado (Peruvian Spanish) or Sangre de Drago (Ecuadorian Spanish), both of which translate to "dragon's blood". They refer to this tree's (and several related species') thick red latex.
Hypothesis: The Spanish phrases Sangre de Grado and Sangre de Drago mean the same thing in English