yellow flower of curlycup gumweed on white, grindelia squarrosa

plant flower branch leaf twig tree herb produce yellow shrub drawing line grass sketch curlycup gumweed isolated white grindelia squarrosa flower grindelia squarrosa curly-top gumweed curlycup yellow isolated white flowers bloom blooming wax sticky weed herb plant curly resinous rosin wildflower nature wild