Old world diamond-flower, also known as flattop millie graines, or Oldenlandia corymbosa is a landscape weed commonly found in Florida's natural areas and landscape beds. This weed grows in a mat-like pattern, spreading from a central point. This plant is harvested from the wild for local use as a food, medicine and source of a dye in some cultures. This species was formerly known as Hedyotis corymbosa before being reclassified as Oldenlandia corymbosa.
- Scientific Name: Oldenlandia corymbosa
- Common Name: Flattop millie graines; Old World Diamond-Flower
- Seasonality: Warm
- Soil Type: Wet to dry
- Toxicity: Non-toxic
- Plant Growth: Annual
- Old World Diamond-Flower Biology and Management in Turf