1. A lady fern with deeply cut leaf segments; found in the Rocky Mountains
   - Alpine lady fern

Type of: Athyrium filix-femina, lady fern

• Spergula
• Spergula arvensis
• Spergularia
• Spergularia rubra
• sperm
• sperm bank
• sperm cell
• sperm count
• sperm oil
• sperm whale
• sperm-filled
• spermaceti
• spermary
• spermatheca
• spermatic
• spermatic cord
• spermatid
• spermatocele
• spermatocide
• spermatocyte
• spermatogenesis
• spermatogonium
• spermatophore
• Spermatophyta
• spermatophyte