Sambucus L. is a morphologically diverse flora comprising approximately 23 accepted species that are mostly deciduous shrubs, perennial herbs or small trees widespread in almost all regions of the world, excluding extremely cold and desert zones. Sambucus species are difficult to identify based solely on morphological characteristics; thus, there is a necessity for taxonomic clarification since the many so-called species are merely horticultural clones.
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Source: Phys.org