Sagittaria demersa explained

Sagittaria demersa, commonly called Chihuahuan arrowhead, is an annual aquatic plant growing up to 60cm (20inches) tall. The leaves are flat, very long and narrow, up to 55cm (22inches) long but rarely more than 7mm across.^[1]

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).^{[2] [3] [4] [5]} The plant occurs mostly submerged in streams and lakes.

Notes and References

1. Haynes, R. R. & L.B. Holm-Nielsen. (1994). The Alismataceae. Flora Neotropica 64: 1–112.
2. Web site: Sagittaria demersa in Flora of North America @ efloras.org . 2017-01-30 . www.efloras.org.
3. http://bonap.net/MapGallery/County/Sagittaria%20demersa.png Biota of North American Program, Sagittaria demersa
4. Sessé y Lacasta, Martín & Mociño, José Mariano. 1894. Flora Mexicana, Edition 2, Sagittaria triquetra
5. Web site: Lot . Antonio . Ramos . Francisco . García . Pedro Ramírez . 2002-01-01 . Sagittaria demersa (Alismataceae) en la Sierra Tarahumara, México . 2017-01-30 . Anales del Instituto de Biología. Serie Botánica . es.