The authors considered three interspecific hybrids between wild Helianthus species and the cultivated sunflower (H. annuus x H. argophyllus, H. annuus x H. bolanderi, H. annus x H. debilis); moreover, an inbred line ("C") was used as tester. Achene germination was studied at different temperature lwels (5, 1O, 15, 20, 25 and 30ºC). Germinarion percentage and germination energy were determined. The wild genotypes germinate better than iine "C" at 10 and 29ºC. Germination energy increases from low to high temperatures for all the accessions, particularly we can say that H.annuus x H.arggophyllus, H.annuus x H.debilis (at 10 and 29ºC) and H. annuus x H. bolanderi (at 25ºC) have a lower medium germination time than line "C".