Classify the leaf shapes based on their length-to-width ratio and the position of their widest part. Provide the corresponding numbers for each category.

Resolution:

The image presents two main categories for leaf shapes based on length-to-width ratio and the widest part of the leaf blade (excluding the petiole).

Category 1: Length is equal to or slightly exceeds width.

• 1) Ovate (широкояйцевидный): Wider at the base, tapering towards the apex.
• 2) Orbicular (округлый): Circular or nearly circular.
• 3) Obovate (обратно-широкояйцевидный): Wider at the apex, tapering towards the base.

Category 2: Length exceeds width by 1.5-2 times.

• 4) Elliptical (яйцевидный): Elongated, widest in the middle, tapering equally towards both ends.
• 5) Oval (овальный): Similar to elliptical but generally rounder.
• 6) Oblong-elliptical (обратно-яйцевидный): Elongated, widest towards the base, tapering towards the apex.

Answer: The categories and their corresponding numbers are listed above.