بوتوماك جورج بوتوماك ريفرسايد ريفرسايد بارين - CEGL006491

Sticky goldenrod (Solidago racemosa) and stiff-leaved aster (Ionactis linariifolia) on a vertical rock face in Mather Gorge near the mouth of Difficult Run in the Potomac Gorge.  Great Falls Park (National Park Service), Fairfax County. © DCR-DNH, Gary P. Fleming