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This genus includes around 15 species of herbs. The 2 species listed below are agricultural weeds that are common in warmer parts of the Americas and can affect crops like maize or soybeans. Tropical Mexican clover, Richardia brasiliensis, is native to South America, but invasive in other regions like Hawaii or eastern Asia. The plants have opposite leaves with short petioles and small radially symmetric flowers and a funnel-shaped corolla, often with white or pinkish petals.
Currently, the following species have been entered into the system: