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All of the Echinodorus that are in the hobby are from South America or are hybrids/cultivars of South American species. Some have been crossed or mutated for smaller size, and they do not revert. The Cuban chain sword, a grass like specie is the only exception I am aware of. No North American specie has ever been cultivated.
Parviflorus var tropica, and harbich are the smallest sword species other than the grass like species that can be used as a foreground/middleground plant. The "Tropica" sword is commonly available in the USA and has been for years, while the harbich sword has to be imported. The "Compacta" sword is a Florida Aquatic Nurseries hybrid, of what I do not know off hand. The name is decieving though. It has a larger diameter than it is tall, however it is still a tall sword, much taller that the "tropica" sword.
The Apart sword, schlueteri leopard, horizontilas, and a few others are considered dwarf, but not miniature
Parviflorus var tropica, and harbich are the smallest sword species other than the grass like species that can be used as a foreground/middleground plant. The "Tropica" sword is commonly available in the USA and has been for years, while the harbich sword has to be imported. The "Compacta" sword is a Florida Aquatic Nurseries hybrid, of what I do not know off hand. The name is decieving though. It has a larger diameter than it is tall, however it is still a tall sword, much taller that the "tropica" sword.
The Apart sword, schlueteri leopard, horizontilas, and a few others are considered dwarf, but not miniature