Sagittaria montevidensis Cham. & Schltdl.

Family: Alismataceae

Pertinent Synonyms & Notes (particularly those used in California; go to GRIN for other synonyms)

only ssp. calycina (Engelm.) Bogin occurs in California

Pertinent Common Names (particularly those used in California; go to GRIN for other common names)

giant arrowhead

Primary Disseminule Type


Description (diagnostics are in brown)

Fruit a winged achene, oblanceolate in outline (outline is of the laterally compressed fruit), 1.8–2.5(4) mm long x 0.7–1.7 mm wide x ca. 0.2 mm thick, with a horizontally-pointing (often curved up at tip) beak (stylar remnant) measuring 0.4–0.5(0.8) mm long near the apex of the ventral wing. Surface light brown, with 1 elongated resin-filled gland on each face, smooth to rough (mildly wrinkled). Pericarp very thin (± transparent) and fragile.

Fruit attachment scar at base, same color as rest of fruit body.

Embryo upside-down U-shaped, its form visible on fruit's surface, endosperm absent.

Similar Species

Similar Species Comparison Chart

Risk Assessment (codes in yellow or red indicate cause for concern; assessments are current as of mid-2011; click AUQP, NZBORIC, or NZBPI for access to the most recent versions of these databases and possible assessment changes)