Distribution:

Left: S.D. County Plant Atlas, as S. nigra susbp. caerulea (http://sdplantatlas.org). Middle (all) and Right (S.D. Co. only): CCH2. Click to see current herbarium records.

Sambucus mexicana
Note the opposite, pinnate (to ternate, rarely simple) leaves.

Sambucus mexicana
The inflorescence is a large compound corymb.
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| iNaturalist Images (as S. c.) |