This section is from the book "Field Book Of Western Wild Flowers", by Margaret Armstrong. Also available from Amazon: Field Book Of Western Wild Flowers.
This little weed is common in waste places and fields and along roadsides, almost all over the world. It is a branching annual, from one to two feet tall, with feathery light green foliage, cut into many long, narrow divisions, almost smooth, with a disagreeable smell and strong acrid taste. The many daisy-like flowers have heads about an inch across, with from ten to eighteen white rays and convex yellow centers. There is a picture of this plant in Mathews' Field Book.

SUNFLOWER FAMILY. Compositae.
There are a good many kinds of Chaenactis, the flower-heads with tubular flowers only, but in some kinds the marginal flowers are larger and have a broad border resembling a kind of ray.
 
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