South Carolina's yellow flowers

Hello, I’m Amanda McNulty with Clemson Extension and Making It Grow. On my drive from Saint Matthews to Sumter, I pass acre upon acre of the fertile Fort Motte farmlands, this year planted mostly in corn and cotton, then cross the Congaree and then miles and miles bordered by the ruderal community. "Ruderal" meaning growing where the natural vegetational cover has been disturbed by humans. This summer it has been dominated by yellow flowers. First to appear were many large patches of a great native, Rudbeckia hirta , the most wide spread native cone flower. Next to flower, and still some are left, were dense patches of Crotalaria spectabalis, or rattlebox, a poisonous invasive. Now there are masses of bitter sneezeweed, Helenium amarum. Now showing up are the many species of goldenrod, Solidago, which are not the culprits for fall sneezes.