GRIN. Taxonomical details, with common names, distribution, and synonyms.
Links for Ruellia humilis
Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zones 3a-9b) (14 photos)
Heritage Perennials - Profile with description and horticultural details. (zone 4 - 9)
Kemper Center - Plantfinder page for one of the plants growing at the Missouri Botanical Garden, with usually one or more photos, horticultural information, and noteworthy characteristics. (zone 4 to 8) (2 photos)
Missouri Plants - Description and photographs of botanical features, with notes about habitat and native status. (6 photos)
Rare Find Nursery - Catalog detail page with description and horticultural information. (zone 6-9) (1 photo)
Rob's Plants - Plant profile with basic horticultural information and often personal observations. Also seed germination records. (3 photos)
(14 photos)