Population sizes vary depending on the amount of disturbance , such as flooding , occurring in the area . Populations have been noted to contain anywhere between one plant and one million plants or more , and some populations disappear for a time . Several populations of the plant were noted to increase after the Great Flood of 1993 , with the most severely swamped populations growing most . Genetic analysis reveals the species is genetically diverse
Great Flood of 1993
Great Flood of 1993
Boltonia decurrens