from The Century Dictionary.
- noun A genus of plants, the type of the order Polemoniaceæ, characterized by its declined stamens, pilose filament-bases, bractless calyx, deeply three-valved capsule, and from two to twelve ovules in each cell.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Bot.) A genus of gamopetalous perennial herbs, including the Jacob's ladder and the Greek valerian.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun any plant of the genus Polemonium; most are low-growing often foul-smelling plants of temperate to Arctic regions
Sorry, no etymologies found.
This one is a Jacob's ladder (Polemonium reptans) called Stairway to Heaven.
For two or three years I do not remember to have seen it, or the seedlings, without flowers; its pretty, dwarf, rue-like foliage grew so thickly that it threatened to kill the edging of gentianella and such things as _Polemonium variegatum_, the double cuckoo-flower, and the little _Armeria setacea_; it also filled the walks, and its long wiry roots have been eradicated with difficulty.
The numerous species, wild and cultivated, of phlox (Fig. 118, _A_), and the blue valerian (_Polemonium_) (Fig. 118, _D_), are examples of the family _Polemoniaceæ_.
_Polemonium cæruleum_ is another plant very subject to this change.
Sidene, was a town called Side, which, it is believed, took the name of Polemonium in honour of Polemion, made King of Pontus by Marcus
_Polemonium coeruleum_, the _Veronica longifolia_, the gloxinias and others.
_Polemonium coeruleum_ album in the neighborhood of the blue-flowered species, the distance  in this case being only 40 meters.
_Polemonium dissectum_, _Salvia sylvestris_ and some others.
In this way I obtained a hybrid between the common Jacob's ladder and the allied species _Polemonium dissectum_.
Polemonium, and Amisus, and Tios, and Amastris, all originally founded by the energy of the Greeks; and Cerasus, from which Lucullus brought the cherry, and two lofty islands which contain the famous cities of