This recent reclassification further divides subgenus "Trifolium" into eight sections. The larva is a stem miner of "Trifolium pratense". Chemical application is needed to assist to remove "Trifolium arvense". The flowers are white or rosy, and resemble those of "Trifolium repens". The "Gold trifolium of Panathinaikos AC" is the major club's award given to special personalities. Rhizobium typically nodulate the roots of "Trifolium", increasing nitrogen availability to the plant. Aquatic fern bearing 4 parted leaf resembling '4-leaf clover' (Trifolium). This species is very closely related to large hop trefoil ("Trifolium aureum"). The first extensive classification of "Trifolium" was done by Zohary and Heller in 1984. Green food, chiefly wild carrot ("Daucus carota") and clover ("Trifolium" spp.) made up 7.17%. King's clover ("Trifolium kingii") grows on open slopes. The national plant is the shamrock ("Trifolium dubium" or "Trifolium repens"). Other favored species include clovers ("Trifolium" spp.) and crabgrasses ("Digitaria" spp.). Carpet clover ("Trifolium monanthum") is found in moist, grassy places up to . "Trifolium repens" is a tetraploid (4n=32) with two diploid ancestors.