frostweed: perennial of the eastern United States having early solitary yellow flowers followed by late petalless flowers; so-called because ice crystals form on it during first frosts
helianthemum: any plant of the genus Helianthemum; vigorous plants of stony alpine meadows and dry scrub regions
bayou: a swampy arm or slow-moving outlet of a lake (term used mainly in Mississippi and Louisiana)