Sagittaria demersa, commonly called Chihuahuan arrowhead, is an annual aquatic plant growing up to tall. The leaves are flat, very long and narrow, up to long but rarely more than across.Haynes, R. R. & L.B. Holm-Nielsen. (1994). The Alismataceae. Flora Neotropica 64: 1–112.
The species is 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).Biota of North American Program, Sagittaria demersaSessé y Lacasta, Martín & Mociño, José Mariano. 1894. Flora Mexicana, Edition 2, Sagittaria triquetra The plant occurs mostly submerged in streams and lakes.
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