Trifolium pratense

Red Clover (Trifolium pratense) is a species of plant. It is native to Europe, Africa, and Asia. It has been introduced to North America, Hawaii, and Puerto Rico. It blooms from spring to early fall. It is found in fields, pastures, and near roadsides. Red Clover likes to grow in thick, dry soil.

Other websites

Trifolium pratense at USDA PLANTS Database
Trifolium pratense at Germplasm Resources Information Network 
Trifolium pratense at Kansas Wildflowers and Grasses 

Category:Faboideae