This study represents a systematic attempt to quantify and compare the degree of familiarity among rural and urban El Salvadorian adolescents with ujushte, Brosimum alicastrum Sw. (Moraceae). To do this, we administered a written questionnaire to 177 students attending school in either San Franciso Menéndez or Apopa, El Salvador. Using a closed-end format, the students provided information about their knowledge of the tree and its fruit, frequency and enjoyment of consumption, method of preparation, and the source of their knowledge. Although most of the rural students knew of the tree and ate its fruit, very few of the urban students indicated familiarity. Statistical hypothesis testing demonstrated that the discrepancy between rural and urban knowledge could not be accounted for by differences in reported socioeconomic status. Grandparents were cited as the most important source of information about ujushte.