- Echinodorus Sadewa
- Echinodorus Sankt Elmsfeuer
- Echinodorus sp. San Carlos
- Echinodorus sp. Saturn (Satan) 2000 (Millenium)
- Echinodorus sp. Saturn (Satan) 2003 (Ibirapuita)
- Echinodorus sp. Saturn (Satan) 2006 (Segurea)
- Echinodorus sp. Saturn 2004 (Rio Paipasso)
- Echinodorus sp. Saturn 2004 (South Brasil)
- Aquarius scaber (Rataj) Christenh. & Byng
- Echinodorus scaber Rataj
- Echinodorus scaber var. proliferatus Rataj
- Echinodorus scaber var. scaber
- Echinodorus Scarlet Snake
- Echinodorus schinzii Buchenau
- Echinodorus schlueteri grüner Leopard
- Echinodorus schlueteri Leopard
- Echinodorus schlueteri Rataj
- Echinodorus Schlumperta
- Echinodorus Schneeleopard
- Echinodorus Schwarzenegger
- Echinodorus Select
- Echinodorus sellowianus Buchenau
- Echinodorus sellowianus var. major Buchenau
- Echinodorus sellowianus var. minor Buchenau
- Echinodorus Serbus
- Echinodorus Shnelya-Shinelya
- Echinodorus Shumperti
- Echinodorus Simply Green
- Echinodorus Simply Red
- Echinodorus Simply Round
- Echinodorus Singapore
- Echinodorus Singapur
- Echinodorus Sinusoid
- Echinodorus Sirene
- Echinodorus Six Soldo
- Echinodorus Smaragd
- Echinodorus Soekarno
- Echinodorus Solar Breadwinner
- Echinodorus spec. (E 136)
- Echinodorus Spidernet
- Echinodorus Spotted Nishtyak
- Echinodorus Stanek
- Echinodorus Star Of The Tundra
- Echinodorus subalatus (Mart.) Griseb.
- Echinodorus subalatus (Mart.) Griseb. subsp. subalatus
- Echinodorus subalatus subsp. andrieuxii (Hook. & Arn.) R.R.Haynes & Holm-Niels.
- Echinodorus subalatus var. minor F.J.Mey.
- Aquarius subulatus (Mart. ex Schult.f.) Christenh. & Byng
- Echinodorus subulatus Engelm.
- Echinodorus subulatus Griseb.
- Echinodorus Subulatus Lucanas
- Echinodorus Sumbawa
- Echinodorus Summer
- Echinodorus Sunset
- Echinodorus Supreme Landscaper
- Echinodorus Sweetheart
- Echinodorus Swimmer
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