Pontederiaceae, the Pickerel-weed Family

Aquatic herbs, with 6 rather conspicuous petals; flowers in summer.

1a. Flowers blue; leaves cordate-sagittate (3-10 dm. high)	Pickerel-weed, Pontederia cordata.
1b. Flowers yellow; leaves linear (submerged)	Mud Plantain, Heteranthera dubia.