Related Clues:

• Lily, for one
• Start to float down river?
• Mature female let down
• The dove's-foot crane's-bill, for instance
• With 50-Down, place that this puzzle grid represents
• River — plant
• Eg, rose or tulip
• Garden growth
• Ox-eye, perhaps following cow
• The Lily of The Nile?
• Come into bloom