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The researchers focused on the genetics behind a sensory cluster known as the nodose ganglia, which are part of the vagus nerves that carry signals between the brain and visceral organs, including the heart.

Phyllodia usually very strongly nodose.

Stem hollow, 2–6° high; leaves reduced to cylindrical hollow pointed nodose petioles; oil-tubes filling the intervals.—Ponds and swamps, Del. to Fla., and west to La. Aug., Sept.

Fruit globose or slightly flattened laterally; dorsal ribs filiform, the lateral thick and corky; oil-tubes solitary in the intervals, 2 on the commissure.—Small perennials, creeping and rooting in the mud, with hollow cylindrical or awl-shaped nodose petioles in place of leaves, simple few-flowered umbels, and white flowers.

Each spine is nearly cylindrical, irregularly curled, and nodose or slightly enlarged at intervals: the apex smooth and pointed; the exterior surface longitudinally and finely ribbed, like the valves.