Arcticus
/ARK-tih-kus/Also known as: arctica, arcticum
Arcticus places a plant in the Arctic — the far northern zone around the pole. Species carrying the epithet live with a very short growing season, long summer daylight and a long, hard winter, and they are often low, compact and quick to flower once the ground thaws. In a garden that usually translates into excellent cold hardiness paired with a dislike of hot, humid summers, which is why arctic plants are more at home in a raised bed or an alpine house than in a warm border. It shades into borealis, "of the north", which covers northern latitudes broadly rather than the polar region itself.
Etymology
From Latin arcticus, "arctic, northern", a word tied to the constellation of the Bear that marks the northern sky.
Example
“Arcticus is a hardiness clue — the plant will shrug off frost but may resent a muggy summer.”