Medicago lupulina (Black Medick)

Plant Info
Also known as: Black Medic
Genus:Medicago
Family:Fabaceae (Pea)
Life cycle:annual, short-lived perennial
Origin:Europe
Status:
  • Weedy
Habitat:part shade, sun; disturbed soil; roadsides, waste areas, fields, lawns
Bloom season:May - September
Plant height:2 to 30 inches
Wetland Indicator Status:GP: FACU MW: FACU NCNE: FACU
MN county distribution (click map to enlarge):Minnesota county distribution map
National distribution (click map to enlarge):National distribution map

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Detailed Information

Flower: Flower shape: irregular Cluster type: round

[photo of flowers] Round flower heads ¼ to 1/3 inches across of 10 to 20 short-stalked flowers at the end of stems arising from leaf axils, the cluster stem much longer than the subtending leaf. Flowers are bright yellow, 1/8 inch or less long, pea-shaped with a broad upper petal (standard) and 2 small lateral petals covering the keel below. The calyx is hairy and has 5 narrow teeth.

Leaves and stem: Leaf attachment: alternate Leaf type: compound

[photo of leaves] Leaves are compound in 3s, alternately attached on stalks up to 1¼ inch long. Leaflets are oval to diamond shaped, typically rounded at the tip and wedge-shaped at the base, to ¾ inch long and 1/3 inch across, hairy to varying degrees, and the end leaflet longer stalked than the lateral leaflets. The tip end of a leaflet may have fine teeth around the edge. Stems are sprawling to ascending, much branched, angled, and densely covered in fine white hairs but may become smoother with age.

Fruit: Fruit type: capsule/pod Fruit type: seed without plume

[photo of fruit] The flower head elongates as fruit develops, becoming a cylindric cluster of 1-seeded pods, turning black when fully ripe. Seeds are brown and oval.

Notes:

Black Medick is a ubiquitous weed often seen hiding in the grass and may be overlooked because of the small flower size. It can grow erect, but is more often sprawling. Hop clovers (Trifolium species) have similar yellow flower heads, but are much larger.

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More photos

Photos by K. Chayka taken in Ramsey County.

Comments

Have you seen this plant in Minnesota, or have any other comments about it?

Posted by: Sophie - Maple Grove
on: 2011-07-20 19:41:36

It's spreading all over our Maple Grove neighborhood and eating our grass.

Posted by: Rebecca - Bemidji
on: 2015-07-08 10:45:23

This flower drives me nuts! I have to constantly try to control it's invasion into my rock beds, because if I ignore it, it will ruin the bed and take over (even when I have laid down protective matting under the rocks). It also has taken over my lawn in places, but on the upside, it likes the sandy soil, so it does stay greener than if my lawn were strictly grass or clover.

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