Cuscuta epithymum (dodder, lesser dodder, hellweed, strangle-tare) is a parasitic plant assigned to the family Cuscutaceae or Convolvulaceae, depending on the taxonomy. It is red-pigmented, not being photosynthetically active. It has a filiform habit, like a group of yarns. Its leaves are very small, like flakes. Its flowers, disposed in little glomerules, have a white corolla, with the androecium welded to the corolla.

In Eurasia, this species of dodder would often attach itself to the Conehead thyme (Thymus capitatus), taking on the plant's pungency. This gave rise to its specific name, which means upon thyme and from whence it also derived its host's Arabic name, al-ṣaʿitrah.

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