Subularia aquatica is an aquatic plant in the mustard family which is known by the common name water awlwort. This is a small herb with awl-like leaves (generally cylindrical but tapering to a sharp point), and growing from a corm above a network of bright white roots. Tiny flowers, each only about a millimeter long, are borne on stalks. Flowers which rise above the surface of the water open, while those that remain submersed stay closed and self-pollinate. The seeds come inside tiny inflated pods. There are two varieties of water awlwort; S. a. var. aquatica is native to Eurasia and S. a. var. americana is native to northern North America. There may also be a Mexican subspecies. This plant grows in ponds, marshes, peat bogs, and other shallow, cold water bodies, often in gravel or sand. NativeNativePalearctic: Siberia: West SiberiaSoviet Far East: Kamchatka OblastNorthern Europe: Denmark, Finland, Iceland, Kaliningrad, Norway, Sweden, United KingdomMiddle Europe: Belgium, GermanyEast Europe: Belarus, Central Russia, Central Black Earth, Northern Russia, North Caucasus, Northwestern Russia, Volga, Urals, Volga-VyatkaSoutheastern Europe: BulgariaSouthwestern Europe: France, SpainNearctic: Subarctic America: Northwest Territory, Yukon Territory, Greenland, AlaskaEastern Canada: Newfoundland and Labrador, Nova Scotia, Ontario, QuebecWestern Canada: British Columbia, Manitoba, SaskatchewanNortheastern United States: Maine, New Hampshire, New York, VermontNorth-Central United States: MinnesotaNorthwestern United States: Idaho, Montana, Washington, WyomingSouthwestern United States: California, Utah