It's nice to know that Justin is safe and sound... I hadn't heard anything from him lately, and was beginning to wonder if "goooooood girl" had gotten ahold of him (see the post on Gentiana saponaria if you're lost).
Rotala ramosior has a C-value of 10 in the Chicago Region, and is a plant of Special Concern in Michigan. It is found most commonly in wet, sandy soils with little competition, often around ponds, in ditches, and where excavation has taken place. It therefore can be considered an early successional species that requires some form of disturbance. This plant was photographed several years ago in Southwest Michigan, growing around an excavated pond with Hemicarpha micrantha (Special Concern in Michigan) and Gratiola virginiana (Threatened in Michigan).
Nice work, Justin. Looking forward to your next quiz.