I can't wait to see more photos of FL springs, plants, animals, rockscapes, etc.!
I've been digging around trying to figure out what plants are found in FL springs. The Rainbow Springs has the following:
Natives
Sagittaria kurziana (~56%)- strap-leaf sagittaria [dominated upper 2/3s of river]
Vallisneria americana (~24%)- eelgrass
Najas guadalupensis (~13%)
Potamogeton illinoensis (1.3%) primarily in headsprings area
Ceratophyllum demersum (19%)
Ludwigia repens (~0.6%) primarily in headsprings area
Myriophyllum sp. (~0.1%) primarily in headsprings area (some of these species are non-natives)
Chara sp. (~7.7%)
Utricularia sp. (~2.2%) primarily in headsprings area
Non-native
Hydrilla verticullata (~37%) dominated downstream portion, consider invasive problem
Nasturitium sp. (~0.04%) primarily in headsprings area, not sure if this is native or not
This information is from "Florida Department of Environmental Protection 2000. Rainbow Springs Aquatic Preserve 2000 vegetation mapping project: an assessment of the plant assemblages. Rainbow Springs Aquatic Preserve, Dunnellon, FL." I've been to this spring. It is really nice but can be really busy.
Silver Glen Spring likely has similar composition dominated by Sagittaria and Vallisneria.
Sagittaria kurziana is widely listed as a dominant of the springs but doesn't seem listed by this name by aquatic plant dealers. I've inquired with Arizona Aquatic Gardens but haven't heard back from them yet. I did come across this listing for it which makes me think it might be listed as either Sagittaria natans or Sag. subulata (do either of these sound right?)
"Sagittaria subulata var. kurziana (GLUCK) BOGIN, 1955
Synonyms: S. kurziana, S subulata var. natans.
Natural Distribution & Ecology: North America.
Physical Description: Leaves 12-20 long, to 2/3" wide, with three longitudinal veins; the central one alone ending at the tip, laterals terminating along the leaf margin."
http://www.wetwebmedia.com/PlantedTk...sagittaria.htm