The genus Philadelphus is comprised of about 65 plants. The native habitat of Philadelphus Mock Orange stretches across North America, parts of Europe, Northern Asia, and Japan. The plant’s historic nostalgia has been forever written into the lore of the American West by the famous Lewis and Clark Expedition. The explorer Meriwether Lewis gathered samples of the intoxicatingly fragrant bush during the return leg of his journey through Idaho and Montana in 1806. The plants he gathered were dubbed the Philadelphus lewissi in his honour.