Subularia aquatica

Subularia aquatica is an aquatic plant in the family Brassicaceae 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.

Distribution
Native
 * Palearctic:
 * Siberia: West Siberia
 * Soviet Far East: Kamchatka Oblast
 * Northern Europe: Denmark, Finland, Iceland, Kaliningrad, Norway, Sweden, United Kingdom
 * Middle Europe: Belgium, Germany
 * East Europe: Belarus, Central Russia, Central Black Earth, Northern Russia, North Caucasus, Northwestern Russia, Volga, Urals, Volga-Vyatka
 * Southeastern Europe: Bulgaria
 * Southwestern Europe: France, Spain
 * Nearctic:
 * Subarctic America: Northwest Territories, Yukon Territory, Greenland, Alaska
 * Eastern Canada: Newfoundland and Labrador, Nova Scotia, Ontario, Quebec
 * Western Canada: British Columbia, Manitoba, Saskatchewan
 * Northeastern United States: Maine, New Hampshire, New York, Vermont
 * North-Central United States: Minnesota
 * Northwestern United States: Idaho, Montana, Washington, Wyoming
 * Southwestern United States: California, Utah