The lateral membrane placenta is arranged along the dorsal suture.

The lateral placenta is arranged along the dorsal suture. Is wrong. Change "back" to "abdomen".

Lateral placenta: carpels united, ovary 1 room. Ovules are attached to the edge of each carpel, such as cucumber and viola yedoensis. The formation of lateral membrane placentation may be due to the combination of multiple open carpel edges. Therefore, there are many types of placenta. Such as marginal placenta and lateral membrane placenta.

The place where the ovule is placed in the ovary is the fleshy protuberance formed by the ventral seam of carpel (the joint of carpel edge), and the ovule is placed on it. There are different types of placenta due to the different number and combination of carpels.

Marginal placentation: 1 single chamber, ovule attached along abdominal suture, such as soybean; Lateral placentation: 1 compound ovary, ovules are sewed along the ventral sides of two adjacent carpels, and the edges form several columns, such as Viola yedoensis; Axillary placentation: a compound ovary with many chambers, carpels rolled in the center of the ovary to form an axis, and ovules attached to the axis, such as lily.

Terri's central placenta: a compound ovary with many chambers, in which the diaphragm and the upper half of the central axis disappear, leaving only the base of the central axis, and the ovule is attached to the base, such as Dianthus; Some plants, such as primrose, have a unique central placenta, which is formed by the healing of carpel base and receptacle upper part.

Carpel is the basic unit of pistil. The pistil of a flower consists of a carpel, which is a single pistil, and two or more carpels are combined to form a compound pistil.

The seam on both sides of carpel is called abdominal seam, and the midvein on the back of carpel is called back seam. The basic ways of peel cracking are cracking along the abdominal seam and cracking along the back seam. Placement of ovule in ovary is placenta. The placenta is sometimes a point, sometimes a line, sometimes a bulge and hypertrophy.