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see phloxphlox,
common name for plants of the genus Phlox and for members of the Polemoniaceae, a family of herbs (and some shrubs and vines) found chiefly in the W United States.
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a genus of perennial and, less frequently, annual herbs of the family Polemoniaceae. The alternate, odd-pinnate leaves have many leaflets, and the light-blue pentamerous flowers are gathered into inflorescences. The calyx is companulate, and the corolla has a campanulate or rotate blade. The fruit is a capsule.

There are approximately 50 species, distributed in the cold and temperate belts of Eurasia, in North America, and, less frequently, in South America. The USSR has 15 species, growing predominantly in the arctic and in the alpine zone of the mountains. Jacob’s ladder (P. caeruleum) is found in the forest and forest-steppe regions of the European USSR and Siberia; it grows in moist meadows, along forest edges, in forests, and along rivers. All parts of the plant, especially the rhizome and the roots, contain saponins, resin, organic acids, and fatty and volatile oils. The saponin content reaches 20–30 percent. A broth or infusion of the rhizomes and roots is used as an expectorant and sedative.

Jacob’s ladder is cultivated as a medicinal plant (in Byelorussia and Western Siberia) and as an ornamental. It is grown on low-lying lands having groundwater close to the surface and having fertile soil with fine texture. The best precursors are clean or occupied fallow, winter crops, or tilled crops. Manure or compost is applied during autumn plowing; granulated superphosphate is added during sowing. Early in the spring of the second year of vegetation the plants are treated with a complete mineral fertilizer. Sowing is done before winter and in early spring. The plant is harvested at the end of the first or second year of vegetation. Other species raised as ornamentals include Polemoniumparviflora and P. pulchellum.


Atlas lekarstvennykh rastenii SSSR. Moscow, 1962.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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Rates of floral evolution: adaptation to bumblebee pollination in an alpine wildflower, Polemonium viscosum.
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Also known as Jacob's ladder, polemoniums thrive in fertile, well-drained soil and don't take an age to establish.
Jacob's Ladder (Polemonium reptans): This wildflower grows in rich woods and is easily identified by its distinctive ladder-like foliage.
Also, look out for the two new plants to be launched at the show from May 21-24 , the Coreopsis "Sweet Dreams" and Polemonium "Bressingham Purple"- available in Blooms Cardiff from the summer.
Behind them I planted a group of Polemonium paucifolrum, a short-lived Jacob's ladder with unusual tubular flowers of soft apricot with brown feathering at their tips.
Measuring pollinator-mediated selection on morphometric floral traits: bumble bees and the alpine sky pilot, Polemonium viscosum.
A variegated form of Jacob's Ladder, Polemonium foliosissimum 'Brize d'Anjou' is a very decorative plant for the front of the border.
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Tomorrow Garden open in aid of the Red Cross, Polemonium Plantery, 28 Sunnyside Terrace, Trimdon Grange, Rrimdon Station, County Durham TS29 6HF, 2-5pm.
Two species, Microsteris gracilis and Polemonium micranthurn, are conspecific with their North American counterparts, while the rest are unique to South America.