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World Checklist of Selected Plant Families (WCSP)

Sagittaria heterophylla var. angustifolia Engelm. in A.Gray, Manual, ed. 2: 439 (1856).

This name is a synonym.

Accepted Name: Sagittaria rigida Pursh, Fl. Amer. Sept. 2: 397 (1813).
Family: Alismataceae
Homotypic Names:

Sagittaria rigida var. engelmannii Farw., Rep. (Annual) Commiss. Parks Boulevards Detroit 11: 44 (1900).

Original Compiler: R.Govaerts