Montanans must understand the biology and ecology of this plant so it can be properly managed in this state as it continues to spread. Oxeye daisy looks like the typical daisy. Flower heads are borne individually on the tops of long slender stems. The petals are slightly notched at the tip. Stems grow 1 to 3 feet tall and are smooth, frequently grooved and sometimes branch near the top.
Leaves progressively decrease in size upward on the stem.
The upper leaves are alternately arranged, narrow and often clasp the stem. The plant has branched rhizomes and strong adventitious roots. However, chamomile is an annual plant with smaller flowers and much more finely dissected leaves. Shasta daisy usually grows 6 to 12 inches taller than oxeye daisy and has larger flower heads. Seeds have 8 to 10 white ridges down the side.