Whorled sunflower (Helianthus verticillatus): A potential landscapeplant

摘要

Helianthns verticillatits or whorled sunflower is a recently designated endangered species found only on a few prairie remnants in Tennessee, Georgia, and Alabama. It is a perennial species that spreads via rhizomes (Mathews et al., 2002) and produces copious amounts of small, black or gray seeds if compatible genotypes are present. This sunflower species is self-incompatible (Ellis and McCauley, 2009).