Thelesperma megapotamicum, commonly known as Hopi Tea or Rayless Greenthread, is a perennial herb native to the Great Plains and desert regions of North America, including the central United States and parts of Mexico and South America. It typically grows 12-24 inches tall and has narrow, threadlike leaves that contribute to its delicate appearance. This plant produces yellow or orange disc florets that are arranged in a composite inflorescence, blooming from late spring to early fall. The flowers are modest in size and not particularly showy, but they do attract pollinators such as bees and butterflies.

Hopi Tea is valued for its drought tolerance and is often used in xeriscaping, a landscaping method that reduces or eliminates the need for supplemental water from irrigation. It thrives in full sun and well-drained soils, making it suitable for rock gardens, native plant gardens, and borders. The plant has a long history of use by Native American tribes for herbal teas, medicinal remedies, and as a source of yellow dye. The Hopi name for this plant is hohoysi, and it is also used to make sun tea, which is brewed using the heat of the sun. While it is generally easy to maintain, it can be susceptible to root rot if overwatered or planted in poorly drained soils. It is not known to be invasive and does not typically present problems when grown in gardens.CC BY-SA 4.0