1. Fern of tropical America: from southern United States to West Indies and Mexico to Brazil
   - black-stem spleenwort, black-stemmed spleenwort

Type of: spleenwort

• unspecific
• unspecified
• unspectacular
• unspell
• unspent
• unspoiled
• unspoilt
• unspoken
• unspoken accusation
• unsporting
• unsportingly
• unsportsmanlike
• unspotted
• unstable
• unstableness
• unstaged
• unstained
• unstaple
• unstarred
• prestigious
• prestigiousness
• prestissimo
• presto
• Preston
• prestressed