Trifolium hybridum, alsike clover, is a plant species of the genus Trifolium in the pea family Fabaceae. The stalked, pale pink or whitish flowerhead grows from the leaf axils, and the trifoliateleaves are unmarked. The plant is 1–2 feet (30–60 cm) tall, and is found in fields and on roadsides – it is also grown as fodder (hay or silage). The plant blooms from spring to autumn (April to October in the northern hemisphere). Originating in mainland Europe, it has become established as an introduced plant in the British Isles and throughout the temperate regions of the world. Despite its scientific name, alsike clover is not of hybrid origin. The plant gets its common name from the town of Alsike in Sweden.
^Lee Peterson, Roger Tory Peterson, Lee Allen Peterson, A Field Guide to Edible Wild Plants of Eastern and Central North America, Boston, Houghton Mifflin, 1978, c1977. 330 p. (The Peterson field guide series, no. 23): pp 56, 124. Google Books
^A R Clapham, T G Tutin, E F Warburg, Flora of the British Isles, Cambridge, 1962, p 341