▁and ▁some ▁se eds ▁used ▁in ▁the ▁production ▁of ▁can ola ▁oil ▁and ▁the ▁cond iment ▁must ard . ▁Over ▁ 3 0 ▁wild ▁species ▁and ▁hy br ids ▁are ▁in ▁cultiv ation , ▁plus ▁numerous ▁cultiv ars ▁and ▁hy br ids ▁of ▁cultiv ated ▁origin . ▁Most ▁are ▁season al ▁plants ▁( ann uals ▁or ▁bien n ial s ), ▁but ▁some ▁are ▁small ▁shr ubs . ▁Br ass ica ▁plants ▁have ▁been ▁the ▁subject ▁of ▁much ▁scientific ▁interest ▁for ▁their ▁agricult ural ▁importance . ▁Six ▁particular ▁species ▁( B . ▁car in ata , ▁B . ▁jun ce a , ▁B . ▁o ler ace a , ▁B . ▁nap us , ▁B . ▁n ig ra , ▁and ▁B . ▁ra pa ) ▁evol ved ▁by ▁the ▁combining ▁of ▁chrom os om es ▁from ▁three ▁earlier ▁species , ▁as ▁described ▁by ▁the ▁Tri angle ▁of ▁U ▁theory . ▁Although ▁of ▁no ▁agricult ural ▁importance ▁of ▁itself , ▁the ▁br ass ica ▁Arab id opsis ▁th al iana ▁is ▁of ▁great ▁scientific ▁importance ▁as ▁a ▁model ▁plant ▁species . ▁ ▁The ▁genus ▁is ▁native ▁to ▁Western ▁Europe , ▁the ▁Mediter rane an ▁and ▁temper ate ▁regions ▁of ▁Asia . ▁Many ▁wild ▁species ▁grow ▁as ▁we eds , ▁especially ▁in ▁North ▁America , ▁South ▁America , ▁and ▁Australia . ▁ ▁A ▁dis like ▁for ▁cab bage ▁or ▁bro cc oli ▁can ▁result ▁from ▁the ▁fact ▁that ▁these ▁plants ▁contain ▁a ▁comp ound ▁similar ▁to ▁phen yl th i oc ar b am