Sagittaria demersa
 Sagittaria demersa is an aquatic plant species native to north-central Mexico (Chihuahua Durango. Hidalgo Aguascalientes Jalisco and Querétaro) and also from a few sites in the northern part of the US State of New Mexico (Mora and Colfax Counties).Sagittaria demersa is an annual herb up to 60 cm tall. Leaves are flat very long and narrow up to 55 cm long but rarely more than 7 mm across. The plant occurs mostly submerged in streams and lakes.