Leaf sheath, which refers to the base of the leaf, which is surrounded by a stalk, is divided by the lower cells of the leaf ygent base, and also produces a dependent organ like a lobe tongue, usually with elongation region, which elongates in two directions, respectively, and divides into a parallel column of tube bundles. Basic information Chinese name Leaf Foreign name leaf sheath Interpretation The base of the leaves, which is surrounded by a stalk. Subject Botany Directory 1 Feature 2 Morphological Structure 3 birch-leaf shank wood 4 Examples of hazards Folding edit features of this segment Leaf Leaf A leaf is a crucible that surrounds the stem, the base of the leaf, which is formed by the division of the lower cells of the base of the leaf. There are also secondary organs that produce like leaf tongues. The lower end is wide and the stem is connected, usually with an elongation area, which, due to the inter-cell growth of the cells, elongates in two directions, and divides into a column of parallel tube bundles. Many kinds of leaves wrap the stem more than a circle, the two edges coincide (the shell of the shoot), and there are two sides of healing into a barrel shape. It is generally difficult to admit that polygonaceae's toy leaves, called och-rea, are considered to be identical organs. Higher plant leaves, the base of the leaf or leaf handle is wider or expanded into flakes, forming a cylinder body of the crucible and the stem is partially or completely closely surrounded, such a structure becomes the leaf. . . leaf leaf or for the crackor or for the closed, in short, is responsible for the protection of buds and interstitial growth and strengthen the support function of the stem function. Folding editing the morphological structure of this paragraph Leaf (Figure 1) Leaf (Figure 1) The stem of the leaf or the base of the leaf handle expands to form a crucible or a cruible between the branches or the stem. Most of the birch plants and umbrella-shaped plants have significant leafy leaves, which function to protect the young interstitating tissues and buds on the stem and to enhance the mechanical support of the stem. Folding and editing this segment of the leaf-handled wood Deciduous trees, 3.5-12 m high; bark gray black; small branches cylindrical, gray-green, hairless, incomplete ring leaf marks, myelin width, soft, white. Leaf mutual, paper, oval-shaped ovoid to wide ovoid, length 10-15 cm, width 8-16.2 cm, above green, light green below, first tip, base shallow heart-shaped, edge of the coarse sawtooth has a whisker, sometimes there are wave-shaped angle, palm-shaped leaf veins 7-9, slightly protruding, near no hair, under the obvious prominent, slightly slightly slightly slightly slightly light, Leaf Leaf Color, hairless, with vertical stripes, the upper cylindrical, gradually expanded down to a crucible, 4.5-8.5 cm long. Total conical flower top, sagging, slightly short soft hair, length 12-22 cm; small flower, male flower of the flower tube is short, there are fissures 5, first end blunt tip, about 0.3 mm; petal 5, long oval, about 5 mm long, white, hairless, first end Hook-shaped inner bend; male 5, with petals, short, hairless, about 0.5 mm long, flower rectangle, 1.5 mm long; flower plate flat, nearly round, in the middle of 1-3 small conical cone-shaped degraded flower column; flower terrier short, cylindrical, Length of about 2-2.5 mm, dredging is short soft hair or near hairless, there are 2 pieces of small sliver, dry film, pin-shaped, about 1-2.5 mm long; , triangle, sharp tip; no flaps and male scoundrels; flower plate is not significant; the sub-room egg is round, about 5 mm long, hairless, flower column 3-4 crack, slightly stout, 3-4 mm long, most of the first 2 cracks. Fruit-core fruity, egg-shaped, 5-6 mm long, 3 mm in diameter, hairless, flower column, purple to gray-black when ripe. Flowering period from November to March; Collapseed edit this section of the hazard example Leaf (Figure 2) Leaf (Figure 2) The seedling period to the spike period can be developed. The seedlings were infected with brown spots on the leaf, and the edges were not obvious. The dark brown dot slots on the leaf or the pulse of the veins of the leaves, and the diamond-shaped dark brown spot is formed after the expansion of the upper and lower branches, with a light brown edge. The junction of the leaves and the veins is a large area of brown disease. Pregnant spike to the spike period of disease Sword leaf leaves first ill and seriously affected, leaf leaves on the brown to dark brown irregular disease spot, the middle color is light, this edge black-brown more clear, serious present tiger-spotted plaque, extended to the whole leaf, causing leaf and larvae to rot. When the humidity is high, the inside and outside of the disease spot is now white to pink mold, that is, the sub-entity of pathogens.