genus Trichostigma ge·nust·ric·hostigma uncommon noun 1. a genus of erect or climbing shrubs found in tropical South America SynonymsTrichostigmagenus Trichostigma Related words Broader terms caryophylloid dicot genus Parts Phytolaccaceae WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.