Summary ²

Medicago lupulina (black medic, sometimes spelled medick or meddick; also known as black hay, black nonsuch, blackweed, etc.) is a summer annual or perennial plant usually considered a weed. It has a tap root. Like other legumes, it has three leaflets; its center leaflet is on a separate petiole. As with other legumes, nitrogen-fixing bacteria, known as rhizobia, are found in nodules on the roots.

Sources and Credits

1. (c) Andreas Rockstein, some rights reserved (CC BY-SA), https://www.flickr.com/photos/74738817@N07/27801988082/
2. (c) Wikipedia, some rights reserved (CC BY-SA), http://en.wikipedia.org/wiki/Medicago_lupulina

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