hairy ruellia

Ruellia humilis grows in dry to average soil in full sun to part shade conditions. Its habitats include prairies, glades, meadows, and open woodland environments. It grows well in dry, shallow, and rocky soils. It has been observed to have a high level of richness of arbuscular mycorrhizal fungi(AMF) diversity when located in calcareous plots as compared to acidic plots. With the general exclusive presence of Ruellia humilis in the United States set, there is more data that indicates, more specifically, the type of biome and regions that this plant shows up in more often. One case study sampling from Buettner Xeric Limestone Prairies, Illinois, Monroe County revealed that when comparing frequency of the plant, the plant had 70% presence in the eastern region of prairie and only 3% in the western region prairie. To place this data in perspective, the eastern region's vegetation covered about 38% of the surface while the western region's vegetation covered about 33.5% of its surface. Both regions' "rock was between 17% and 19%, and bare ground and litter was from 40% to 44%."