Kingdom Plantae Family Asteraceae Genus Helenium | Order Asterales Tribe Helenieae Rank Species | |
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Similar Helenium pinnatifidum, Helenium virginicum, Helenium puberulum, Helenium flexuosum, Helenium mexicanum | ||
Helenium quadridentatum is a North American plant in the sunflower family, commonly known as Longdisk sneezeweed. It is found in the southeastern and south-central United States (Alabama, Mississippi, Louisiana, Texas, Oklahoma) as well as Mexico (from Tamaulipas to Yucatán), Cuba, Guatemala, and Belize.
Helenium quadridentatum is an annual herb up to 100 cm (39.5 in) tall, with small wings running down the sides of the stems. Leaves are sometimes broadly elliptical, other times very narrow and grass-like. One plant generally produces up to 50 flower heads, in a branching array. Each head has an egg-shaped or conical disc containing can have 500 or more minuscule disc flowers each 1.1–1.8 mm (0.043–0.071 in) across, each yellow toward the bottom but yellow-brown toward the tip. There are also 10-15 yellow ray flowers.