Polemonium foliosissimum, the towering Jacob's-ladder, is a rare species of flowering plant in the phlox family Polemoniaceae, native to the western United States; Arizona, Colorado, Idaho, Nevada, New Mexico, Utah and Wyoming.

[2][1][3] As its synonym Polemonium archibaldiae it has gained the Royal Horticultural Society's Award of Garden Merit.

[4] The following varieties are accepted:[1]

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