One of the roadside yellows this time of year, other than goldenrod, is tickseed sunflower (Bidens), so-named because the seeds are dark and--prepare for unflattering comparison-- the size of wood ticks. It's a native annual, though I notice it's considered invasive in Canada by the USDA site. This is an example of an attractive wildflower that in a garden can start to become too much of a good thing, overgrowing everything else in late summer. It's tempting to oblige its exuberance for the big show of color, but with some species of Bidens the "big show" never materializes.
One common Bidens hereabouts, typically called Beggar-Ticks, turn out to be devoid of the colorful ray flowers.
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