52a. Mature pedicels usually
shorter than adjacent petioles; stipules
divided
into thin segments;
fruit prickly.....................................................................
#46.
Burclover.
Medicago polymorpha.
52b. Mature pedicels usually longer than adjacent petioles; stipules
entire;
fruit not prickly......................................................................................
#47.
Black Medic.
Medicago lupulina.