It seems like we see more yellow wildflowers than any other color, but maybe that's because they grow in such large patches as opposed to a small blue Chicory flower here and there.
Yellow Star Thistle (Centaurea solstitialis) might not be the most unique yellow wildflower, but there are so many purple Milk Thistle at the Sacramento National Wildlife Refuge that I like seeing the burst of yellow along the auto tour route.
See what I mean about those purple Milk Thistles! These were at the Gray Lodge Wildlife Area in mid-April, creeping in on a bunch of White Mustard (Sinapis alba). White Mustard can be seen growing everywhere in the central valley and is anything but white.
I couldn't do a post about yellow wildflowers without mentioning the Mule's Ears (Wyethia) of Lassen VNP. These cheery beauties cover a huge amount of the mountainside when you're driving through the park and look just as pretty from up-close.
We spotted this lovely Water Primrose (Ludwigia peploides) at the Colusa National Wildlife Refuge and we've also seen it at the Sacramento National Wildlife Refuge as well. It's considered an invasive weed, but it sure has beautiful flowers and the grebes love swimming around in it.
Which color of wildflower do you see the most often?