Silphium lacineatum
Leaves to 30 inches high
Flower stalk to 48 inches high.
Studies of mature prairie found roots of this plant extending over 35 feet deep down into the prairie subsoils.
Leaves align their edges north and south to take advantage of morning and late afternoon sun but avoid midday sun. This is a water conservation attempt, so mature plants that have deep enough roots no longer need to align their leaves to conserve moisture.
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