(Zhangjiakou City Flower) Scientific name Dahlia pinnata Common name Dyna Dali Alias ​​Dali, Dahlia, Peony Peony, Passiflora, sweet potato family name Asteraceae morphological characteristics of perennial herbs. The underground part has a thick, spindle-like fleshy root, which resembles sweet potatoes. Stem height 50cm-250cm, erect thick and hollow. Leaves opposite, 1 split - 3 split. The capitulum has a long peduncle and is terminal; the outer part is rayed, unisexual, and the shape and color vary greatly; the center is a tubular flower, bisexual and mostly yellow. Flowering from June to October. Achene, oblate oval, black. There are as many as 30,000 cultivars, making it one of the world's most horticultural varieties and the most colorful and colorful flowers. In addition to blue and green, there are other colors, there are complex colors and mosaic colors. There are many changes in flower types, including single-petal, ring-necked, double-petal, round-ball, hydrangea, decorative, waterlily, cactus, chrysanthemum, chrysanthemum, felt, semi-cactus, and Pulsatilla. . The reason why Dahlia has so many varieties and changes in its color form is that it is a multi-source hybrid, and there are 27 species in total. It is known that several species or several natural hybrids are involved in crossbreeding. Formed a huge cluster of garden products today. Cytological studies confirmed that they are heterologous octaploids, genetic genes are complex and abundant.
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