Species of plant in the genus Polemonium
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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. As its synonym "Polemonium archibaldiae" it has gained the Royal Horticultural Society's Award of Garden Merit.
Subtaxa.
The following varieties are accepted:
References.
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