Halorageae
An order of herbs or under-shrubs, rarely annual, aquatic, or terrestrial. Flowers often axillary, solitary, or aggregate, sometimes whorled in a spike, rarely pedicelled, sometimes panicled. Leaves usually opposite or whorled, simple, entire or toothed, the submerged ones usually pectinate, rarely entire; stipules none, or (in Gunnera) adnate to the petiole. The species are sparingly dispersed throughout the world, and may be found in damp places, ditches, and small streams, sometimes submerged. There are nine genera and eighty species. Well-known examples are : Gunnera and Hippuris.