Chamomilla occidentalis Greene Matricaria occidentalis, commonly known as valley mayweed,[1] is an annual plant native to North America.

The stem is either branching or below the corymbose summit.

It is 15–45 cm (5.9–17.7 in) high; not strongly scented; heads as much as 1.5 cm (0.59 in) in diameter, conical in shape and greenish yellow in color; achenes are sharply angled.

It is extremely similar to pineapple weed.

It is native to California and Oregon.