North American annual plant with usually yellow or orange flowers; grows chiefly on wet rather acid soil
prostrate or semi-erect subshrub of tropical America, and Australia; heavily armed with recurved thorns and having sensitive soft gray-green leaflets that fold and droop at night or when touched or cooled
Mediterranean vine having oblong fruit that when ripe expels its seeds and juice violently when touched
prostrate or semi-erect subshrub of tropical America, and Australia; heavily armed with recurved thorns and having sensitive soft grey-green leaflets that fold and droop at night or when touched or cooled
