Reproductive and Genetic Patterns in Virginia Spiraea (Spiraea virginiana Britton; Rosaceae) Reveal a Fragmented Species, Frozen in Place and Time
Spiraea virginiana Britton (Virginia spiraea), a threatened riparian shrub whose range extends through the Appalachian and Blue Ridge Mountains, reproduces primarily asexually. Successful seed production is rare under field conditions, but the relative contributions of intrinsic factors and pollinators are unclear. Open, selfed, inbred, and outbred pollination treatments were applied to populations of S. virginiana […]