1 花器构造和开花习性胡萝卜为复伞形花序,着生于花枝顶端。每一小伞形花序有10～160朵花处于花苞内。雌雄同株,异花虫媒授粉。花多为二性花,也有单性花,无花托,花瓣5枚,离瓣,多为白色,有的品种略带紫色,花瓣外缘向内弯曲。雄蕊5枚,雌蕊2枚,为二室的下位子房。每室有胚珠一个,受精后发育成两粒种子的双悬果。胡萝卜为绿体春化低温感应型长日照作物,植株长到一定大小后,在1～3℃条件下60～80天通过春化阶段,在4小时以上的长日照条件下通过光照阶段。胡萝卜一般在早晨开花,经一昼夜柱头可接受花粉。一般雄花早于雌花开放。同一株主茎上的花序先于侧枝上的 1 flower structure and flowering habit Carrot compound umbel, was born in the top of the flower. Each Umbellulus has 10 to 160 flowers in the bud. Hermaphroditic, different flower vector pollinator. Flowers are more than two flowers, but also unisexual flowers, no torus, petals 5, from the flap, mostly white, and some species slightly purple, inward curvature of the petals outside. 5 stamens, 2 pistils, two-compartment lower ovary. Each room has a ovule, after fertilization developed into two seeds of double hanging fruit. Carrots are chloroplasts vernalization low-temperature induction long-day photoperiod. After grown to a certain size, the plants pass through the vernalization stage at 1 to 3 ℃ for 60 to 80 days and pass through the illumination stage under long-day conditions of more than 4 hours. Carrots generally flowering in the morning, and pollen can be accepted by the stigma throughout the day and night. The male flowers bloom earlier than the female flowers. Inflorescences on the same plant stem precede the branches