The tree in Chongqing is the yellow kudzu tree, also called the yellow jue tree.

In Chongqing dialect, the pronunciation of "jiao" and "ge" are the same, so Chongqing people have always called the yellow kudzu tree "huangjue tree". The city tree of Chongqing is the yellow kudzu tree, also called the yellow jue tree. This kind of tree is very long-lived. Ancient trees that are hundreds or even hundreds of years old are very common in Chongqing. They are like giant umbrellas, protecting people from wind and rain. During Guyu season, a large number of fallen leaves can be seen everywhere on the streets of Chongqing, among which the yellow kudzu tree is the most obvious.

The yellow kudzu tree is a tall deciduous tree with a thick stem and a peculiar tree shape. It has overhanging roots and exposed claws, and is winding and intertwined. It has an ancient style. Its branches are densely packed, the big branches extend horizontally, and the small branches are curved obliquely. The vitality of this kind of tree is extremely tenacious. Many of them grow on stone ridges, stone cliffs and city walls. Their roots are tightly embedded in the cracks of the stones and stand erect. It is an "aerial root" plant that requires only a small amount of roots to be placed in the soil to grow, and the exposed roots can absorb water directly from the air.

Growth habits of Huangkudzu tree

The inflorescence and fruit development of Huangkudzu tree is synchronous within the plant and asynchronous between plants. The inflorescence and fruit development process can be divided into five stages: pre-female stage, female flowering stage and inter-flowering stage. , male flowering stage and late flowering stage. The kudzu tree bears fruit all year round. There are two obvious peak periods of inflorescence bud germination in January-February and June-July each year, and a single plant bears fruit 1-3 times a year.

The development time of the inflorescence fruit of the yellow kudzu tree from the pre-female stage to the late flowering stage varies with the season. Generally, it develops slowly in winter and spring, that is, from December to May of the following year, and the longest one lasts nearly 130 days; In autumn, from June to November, growth is faster and the flowering period is significantly shortened. It only takes about 80 days from the pre-female stage to the late flowering stage. The number of bees entering a single fruit during the female flowering period of the kudzu tree is overwhelmingly dominated by one, which enables effective bee entry for small but large inflorescence fruits, which not only greatly improves the pollination efficiency of small bees, but also ensures a high fruit setting rate of inflorescence fruits.