on steep lower canyon talus slope of rhyolitic tuff debris. This variety exhibits yellowish bark, larger and more numerous flowers, larger, more pubescent leaves per Gentry
on steep lower canyon talus slope of rhyolitic tuff debris. This variety exhibits yellowish bark, larger and more numerous flowers, larger, more pubescent leaves per Gentry
on steep lower canyon talus slope of rhyolitic tuff debris. This variety exhibits yellowish bark, larger and more numerous flowers, larger, more pubescent leaves per Gentry
rhyolitic tuff gravels along Rio Batopilas. This variety exhibits yellowish bark, larger and more numerous flowers, larger, more pubescent leaves per Gentry