The features of hard coat of Cuscuta japonica Choisy and C. Campestris Yunck. (Cuscutaceae Dum.)

The features of hard coat of two species of dodder - Cuscuta japonica Choisy and C. campestris Yunck. (Cuscutaceae Dum.), The influence of ecological and geographical conditions on hard coat for example, the Amur region. It is shown that under laboratory conditions to overcome the dormancy of these species, requires chemical stratification in concentrated sulfuric acid (H2SO4 conc.). Host-plants do not affect the Japanese dodder seed germination, therefore, the statement about the impact of the plant-hosts on the germination is not universal, at least for the species.