向日葵也叫葵花,来源于美洲,在引入欧洲后由观赏植物逐渐改造成油料作物。向日葵浑身是宝,既有药用价值又有食用价值,还有其他方面的经济价值,按照类型和用途可分为食用向日葵、油用向日葵和观赏向日葵。其为1年生草本,高1~3米。茎直立,粗壮,圆形多棱角,被白色粗硬毛。叶通常互生,心状卵形或卵圆形,先端锐突或渐尖,有基出3脉,边缘具粗锯齿,两面粗糙,被毛,有长柄。头状花序,极大,直径10~30厘米,单生于茎顶或枝端,常下倾。总苞片 Sunflower, also known as sunflower, is derived from the Americas and gradually transformed from ornamentals into oil-bearing crops after its introduction in Europe. Sunflower whole body is treasure, both medicinal value and food value, there are other aspects of economic value, according to the type and use can be divided into edible sunflower, sunflower oil and ornamental sunflower. It is a one-year-old herb, 1 to 3 meters high. Stems erect, stout, rounded, angular, white-haired. Leaves often alternate, heart-shaped ovate or ovoid, apex acute or acuminate, base 3 veins, margin with serrate, rough on both sides, coat, long handle. Flower head, very large, 10 to 30 cm in diameter, solitary in the stem or branch tip, often declining. Total bracts