Helianthus verticillatus Small
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Detail
- Family
- Asteraceae
- Botanical Name
- Helianthus verticillatus Small
- Common Name
- Whorled Sunflower
- Synonym(s)
- Flora of Virginia Name/Status
- Not in Flora of Virginia
- Comments
- Known from two locations where circumstances strongly indicate horticultural origin. In each case, the placement of the colonies seems planned and the habitat implausible. The species is available as a "niche" product in the nursery trade, so a planted origin is possible. However, Moore et al (Castanea 86(2) 2021) report unique genetic variation in the Franklin County material and evidence that the population experienced a genetic bottleneck. The Roanoke County plants have not been sampled molecularly. For now we are treating the Franklin population as of Uncertain origin and the Roanoke population as Introduced.
- Habitat
- At the Franklin County site, the small colonies occur adjacent to one another at the edge of a mowed, mid-elevation upland field. The Roanoke population consists of several large colonies of similar size, each occurring roughly equidistant from one another along a boardwalk through a eutrophic wetland. The lack of colonies elsewhere in this wetland complex is suspicious.
- Native Status
- Not Specified
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