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Similar Polemonium pulcherrimum, Polemonium occidentale, Polemonium micranthum, Polemonium viscosum, Polemonium vanbruntiae | ||
Polemonium foliosissimum, the towering Jacob's-ladder, is a rare species of flowering plant in the phlox family found in the United States.
References
Polemonium foliosissimum Wikipedia(Text) CC BY-SA