That reproduces via seeds (rather than spores)(adjective)
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Use "phanerogamic" in a sentence
"Diversity and origins of the phanerogamic flora of Mexico."
"His activity was by no means confined to palaeobotany, but extended into all branches of botany, more particularly anatomy and phanerogamic taxonomy."
"In the Miocene period especially, the similarity of the types of phanerogamic plants with their present offspring, becomes so striking that in a large number of cases specific distinctions rest in greater part on theoretical conceptions rather than on real facts."