Why is the tip of Parthenocissus tricuspidata facing down? Why is it so evenly spread on the wall without overlapping?

Parthenocissus tricuspidata leaves for the following reasons:

1. Parthenocissus can climb on vertical walls. It climbs one foot at a time and blocks the wall when it grows one foot. With tender leaves, it grows another foot to block the wall, and then grows tender leaves, and so on.

2. Parthenocissus tricuspidata's feet are on the opposite side of the petiole, so that the whole stem can be pulled up and the tip of the leaf naturally faces down.

Parthenocissus tricuspidata has feet, and each foot pulls the stem and leaves to climb up and climb on the vertical wall, so that the leaves will face down because of the unified gravity? .

There is no overlap for the following reasons:

Plants need sunshine to grow. Where they can get sunshine, they will grow leaves. If it is covered, the leaves will naturally not grow in places where there is no sunshine, just like paving the floor. In order to get more sunlight, different leaves will be unevenly distributed to ensure that each other can get uniform illumination.

Extended data:

Morphological characteristics of Parthenocissus tricuspidata;

Parthenocissus tricuspidata is a large perennial deciduous woody vine, and its appearance is similar to that of wild vines. Rattan stems can be as long as 18 meters (about 60 feet). Flowering in summer, small flowers, inconspicuous clustering, yellow-green or berry purple-black, opposite to leaves. Flowers are mostly hermaphroditic, and cymes are often planted on short branches between two leaves, which are 4 ~ 8 cm long and shorter than petioles; Spend 5 numbers; Calyx entire; Petal apex reflexed, ovary 2-loculed, with 2 ovules per locule.

The epidermis has lenticels and the pith is white. The branches are stout, the old branches are grayish brown, and the young branches are purplish red. There are tendrils on the branches, which are short and multi-branched. There are sticky suckers at the top and tip of tendrils, which can be attached to objects, whether rocks, walls or trees.

The leaves are alternate, the leaflets are thick, the base is wedge-shaped, the variation is large, the edges are coarsely serrated, and the veins are symmetrical. The leaves on the flower branches are ovate in width, 8 ~ 18 cm long and 6 ~ 16 cm wide, and often 3-lobed, or the leaves on the lower branches are divided into 3 leaflets with a heart-shaped base. The leaves are green and hairless, with white powder on the back and hairy veins on the back, which turn bright red in autumn. The leaves on the young branches are very small and often do not divide. Berries are small spherical and blue-black when mature, which is popular with white powder and birds. Flowering in June and fruiting in September to 65438+ 10.

References:

Parthenocissus Baidu encyclopedia