castor beans plant on field in brazi ricinus communis seeds and flowers with selective focus

agribusiness agriculture biodiesel biofuel brazil brazilian closeup economy ricinus communis rural vegetal agricultural agroindustry biology botanical botany castor bean crop economic energy environment environmental farm farming farmland field flora foliage fresh garden green growing herbal industrial leaf medicinal medicine natural nature northeastern oil oilseed organic plant plantation purgative semiarid toxic tropical vegetation beans brazi seeds flowers selective focus