S. bicolor (L.) Moench lines and their F1 progenies were observed for characteristics indicating apomixis. Observations of sections and whole mounts of ovaries revealed multiple embryo sacs. Frequencies of multiple embryo sacs of up to 4 per ovule and 23.3% of ovules with multiple embryo sacs indicated potentials for spomixis in 5 lines of sorghum and in some of their progeny. Progenies were established from crosses among apomicitic lines and with sexual lines. Progeny from test-crossing lines and F1 progenies with a dominant marker stock revealed a low and varied level of maternal-type offspring. These lines have a low level of apomictic seed formation and differ in their ability to transmit the characteristic of facultative apomixis to their F1 progenies.