The family Campanulaceae ( also bellflower family ) , of the order Asterales , contains about 70 genera and 2000 species , you are probably familiar with bellflowers and cardinal flower and think of these as a group of small herbaceous flowers . The family Campanulaceae ( also bellflower family ) , of the order Asterales , contains about 2000 species , in 70 genera , of herbaceous plants , shrubs , and rarely small trees , often with milky non-toxic sap .