Two new occurrences of Aristolochia in Brazil are reported here. Aristolochia cremersii, hitherto known from French Guiana, was collected in Oriximiná/Pará, and A. argentina, with previously known distribution in Argentina, Bolivia and Paraguay, was recorded in Bodoquena/Mato Grosso do Sul. The latter species was identified based on photographic records. We provide descriptions, morphological comments, a preliminary extinction risk assessment (with one of them applying the rapid Least Concern method) and illustration/images of the 2 species, and finally discuss the use of photographs as valuable scientific records.