Review of the Sagittaria engelmanniana Complex (Alismataceae) with Environmental Correlations

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Abstract
Three taxa of Sagittaria, previously treated as subspecies of S. engelmanniana were shown to be distinct species on the bases of standard herbarium techniques and experimental interfertility studies. Taxa recognized are S. engelmanniana, S. brevirostra, and S. australis (previously known by the misapplied name longirostra). Environmental parameters correlated with the distribution patterns of each of the three taxa appear to be effective, probably in combination with other environmental factors, in limiting the distributions of these species. A key to these taxa and closely related S. latifolia and S. cuneata is provided.

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