I'm curious what plant this is! I found it at 37°52'23.2"N 122°16'55.3"W (north of Oakland, California, USA).
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It looks a lot like Queen Anne's Lace, but yellow and with more slender leaves. I believe it's Sweet Fennel (Foeniculum vulgare). It's in the Apiaceae family, which has a lot of edibles: carrots, parsley, fennel, anise, caraway, celery, chervil, cicely, cilantro, cumin, dill, parsnips and more. Black swallowtail butterflies lay their eggs on this, so often you can find a really fine caterpillar on them; bees like the flowers as well.
Apiaceae has 3,700 species spread across 434 genera; it is the 16th-largest family of flowering plants. It has a few poisonous plants, like water hemlock (white flower) and poison hemlock (also white). Wild parsnip has a very similar yellow flower but it's sap is wildly irritating in the medical sense (it will cause pain and blisters); its leaves are very different.
If you crush some of the slender leaves between your fingers, it should smell like fennel (a common spice, e.g. in Italian sausage), or if you aren't familiar with that, a bit licorice-like.
Sweet fennel (left, up to 6 feet tall) Wild Parsnip (right, 3-5 feet tall)
That's East Indian Fennel. It's a member of the celery family. Every part is edible, including the root and the seeds. It's packed with vitamins, calcium and is used to stop restless leg syndrome, among other ailments. The feathers (leafs) can be used to wrap meat and fish before baking or eaten fresh on a green salad. Once par boiled they lose their licorice taste and can be eaten like steamed spinach. The Italians brought it over in the early 1800s and it flourished. It grows along the freeways of California and other states. I pick large batches of it for my juice extractor and other things. Look up the many medicinal uses of fennel. The flowers look similar to dill.