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, New Mexico, and Utah. As its synonym Polemonium archibaldiae it has gained the Royal Horticultural Society's Award of Garden Merit.
Taxonomy In 1878 a new species in the Polemonium genus was scientifically described by Asa Gray, which he named Polemonium foliosissimum. Together with its genus it is part of the Polemoniaceae family. Although the species has no accepted subspecies or varieties, it has some among its ten botanical synonyms.
Table of Synonyms Name Year Rank Notes Polemonium archibaldiae 1901 species = het. Polemonium filicinum var. archibaldiae 1907 variety = het. Polemonium foliosissimum subsp. archibaldiae 1942 subspecies = het. Polemonium foliosissimum var. molle 1968 variety = het. Polemonium foliosissimum f. molle 1942 form = het. Polemonium foliosissimum subsp. robustum 1907 subspecies = het. Polemonium foliosissimum subsp. verum 1942 subspecies ≡ hom., not validly publ. Polemonium molle 1905 species = het. Polemonium pterospermum 1903 species = het. Polemonium robustum 1904 species = het. Notes: ≡ homotypic synonym; = heterotypic synonym
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