B. maritima: stems erect or spreading, branched, two feet high; leaves broad, triangular-ovate, thick, green, the upper ones small, narrow; flowers green, single or clustered, in long, loose, terminal spikes, often branching into a leafy panicle; the ripe perianth forming a hard, angular, often prickly mass, enclosing a single horizontal seed. - Sea-shore. Fl. July to September.