Families (As per The Plant List)

 
A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | A-Z

S

Salviniaceae - 3 (Azolla pinnata, Azolla pinnata subsp. asiatica, Salvinia molesta)

Schizaeaceae - 1 (Schizaea digitata)

Selaginellaceae - 14 (Selaginella bryopteris, Selaginella chrysocaulos, Selaginella ciliaris, Selaginella delicatula, Selaginella involvens, Selaginella longipila, Selaginella miniatospora, Selaginella plana, Selaginella plumosa, Selaginella proniflora, Selaginella radicata, Selaginella repanda, Selaginella tenera, Selaginella wightii)