The character found only in halophytes is
Vivipary is the special type of seed germination. During germination, seed is till attached to parent plant and nourished by it. It generally occurs in mangrove plant. The mangrove plants are generally medium sized tree which grow in salty marshes of sea coasts. (eg. Rhizophora, Sonneratia, Avicennia). The seeds of mangrove plants cannot germinate on the marshy habitat because of the excessive salt concentration and lack of oxygen. So, the correct answer is ‘Vivipary’.