Rhinanthus minor

Rhinanthus minor, the yellow rattle, little yellow rattle or cockscomb, is a flowering plant in the genus Rhinanthus in the family Orobanchaceae, native to Europe, northern North America, and Western Asia.

It is a hemi-parasitic herbaceous annual plant that gains some of its nutrients from the roots of neighbouring plants. It grows to 25–50 cm tall, with opposite, simple leaves, with a serrated margin. The flowers are yellow, produced on a terminal raceme. The fruit is a dry capsule, which contain loose, rattling seeds when ripe; the plant's name refers to these. Its preferred habitat is dry fields or meadows, where its flowering period is between June and September. In Ireland and Scotland, this species is often associated with Machair habitat.

Research at the UK's Centre for Ecology and Hydrology has shown that encouraging yellow rattle to grow in hay meadows greatly increases biodiversity by restricting grass growth and thereby allowing other species to thrive. The seeds are spread very effectively by traditional hay-making practices.