The Perdido River forms the border between Florida and Alabama. Styx and Blackwater Rivers are tributaries that have water that is just as acidic and blackish-brown, but otherwise crystal clear, as their main stream. Today we took a boat trip in the area where the three rivers meet. R. austrinum does not exist here, the rivers are probably just too acidic. R. serrulatum, however, thrives everywhere. Now in July, the plants were in full bloom. But the earliest specimen blooms already at the end of April and the last as late as September or October. We also made an excursion on land. The “Indian Mound” between Blackwater River and Reeder Lake is a ancient sand dune, which is now covered with many drought tolerant and -loving plants, including even cacti. A remarkable contrast to the water landscapes we had seen before and in the immediate vicinity from the boat.