Lotus corniculatus L.
Family: Fabaceae
bird's-foot deer-vetch, bird's-foot trefoil
Lotus corniculatus image
Robert Bierman  
Etymology: Lotus: from Greek and originally applied to a fruit which was said to make those who tasted it forget their homes
Plants: erect to drooping, perennial, 6"-24" tall, mostly smooth forb; taprooted
Leaves: mostly stalkless, 5-parted with the lower 2 leaflets separated from the other 3 crowded leaflets
Flowers: yellow turning orange with brick-red marks, 5-parted, 1/3"-1/2" long; inflorescence a long-stalked, rounded, head-like cluster (umbel) of 4 to 8 stalked flowers from the upper leaf axils; blooms June-Aug.
Habitat: disturbed sites
Hazardous: Careful, this plant is hazardous!
Invasiveness: Invasive - Eradicate!
Conservation Status: Introduced - naturalized; ecologically invasive