1. [n]  any of several hairy North American herbs having yellow racemose flowers and inflated pods
2. [n]  any of several plants of the genus Physaria having racemose yellow flowers and inflated pods
3. [n]  annual or perennial herbs with inflated seed pods; some placed in genus Lesquerella
4. [n]  North American wild lobelia having small blue flowers and inflated capsules formerly used as an antispasmodic

BLADDERPOD is a 10 letter word that starts with B.