blue cardinal References Images blue cardinal plant Ask Anything Homework Help Also known as: Lobelia siphilitica, great blue lobelia Written by The Information Architects of Encyclopaedia Britannica The Information Architects maintain a master list of the topics included in the corpus of Encyclopædia Britannica, and create and manage the relationships between them. The Information Architects of Encyclopaedia Britannica Britannica AI Ask Anything Learn about this topic in these articles: cardinal flower…siphilitica) is sometimes called the blue cardinal and has blue or whitish flowers. Read More…siphilitica) is sometimes called the blue cardinal and has blue or whitish flowers. Read Morelobelia/ Major species…as great blue lobelia (L. siphilitica) and its hybrids, also have blue flowers. Various lobelia hybrids constitute a fine group of fairly hardy and showy garden plants. Read More…as great blue lobelia (L. siphilitica) and its hybrids, also have blue flowers. Various lobelia hybrids constitute a fine group of fairly hardy and showy garden plants. Read More