Template:Taxobox Trifolium aureum, known by the various common names large hop trefoil, large trefoil,<ref name=grin>Template:GRIN</ref><ref name=BSBI07>Template:Cite web</ref> large hop clover,<ref name=grin/> golden clover<ref name=plants>Template:Cite web</ref> or Hop clover, is a species of clover native to much of Eurasia.
Large hop trefoil is a small erect herbaceous biennial plant growing to 10–30 cm tall. Like all clovers, it has leaves divided into three sessile leaflets, each leaflet 15–25 mm long and 6–9 mm broad. Its yellow flowers are arranged into small, elongated round inflorescences 12–20 mm diameter, located at the end of the stem. Each individual flower is decumbent. As they age, the flowers become brown and paper-like. The fruit is a pod usually containing two seeds.
The closely related Trifolium campestre (hop trefoil) is a similar, but shorter, spreading, species with smaller leaves and flowers. The middle leaflet of its leaves also has a short rachis.
Cultivation and uses
Trifolium aureum is native throughout Europe (in Russia this includes non-European Ciscaucasia and western Siberia; in Spain only in the north-east; and in the European portion of the Ukraine this includes Crimea); western and northern Asia and the Middle East (in Armenia; Azerbaijan; Georgia; northern Iran; Lebanon; and Turkey); and Africa (limited to the Canary Islands).<ref name=grin/>
Trifolium aureum is widely naturalized in North America:<ref name=grin/> it was first introduced to the U.S. (by way of Pennsylvania) in 1800,Template:Citation needed where it is now found in the western (as far north as Alaska) and eastern regions of the country, but not in the middle, or very much in the southern states.<ref name=plants/> It is also now found in Canada in all of its southerly provinces (with a possible exception being Manitoba).<ref name=plants/>