https://plantlust.com/plants/38075/silphium-asteriscus-var-simpsonii/
Silphium asteriscus var. simpsonii | Silphium simpsonii | plant lust
Silphium asteriscus var. simpsonii is a broadleaf deciduous perennial with green foliage. In summer yellow flowers emerge. Grows well with sun - mostly sun and...
silphiumasteriscusvarplantlust
https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=195533&print_version=SCR&source=from_print
ITIS - Report: Eriogonum microthecum var. simpsonii
The Integrated Taxonomic Information System (ITIS, www.itis.gov) partners with specialists from around the world to assemble scientific names and their...
itisreporteriogonumvar