The image depicts a botanical illustration of a plant, specifically a species of Penstemon. The illustration is detailed and shows the plant's structure, including its leaves, stems, and flowers. The plant appears to be a flowering plant, likely a member of the family Penstemonaceae, which is known for its tall, upright stems and showy flowers.

The illustration includes several elements:
1. **Leaves**: The leaves are long and narrow, with a slightly serrated edge. They are arranged in a spiral pattern around the stem.
2. **Stem**: The stem is sturdy and straight, supporting the flower stalks.
3. **Flowers**: The flowers are small and clustered at the top of the stem. They have a yellowish-green color and appear to be in a stage of bloom, with some petals still closed.

The background of the illustration is white, which helps to highlight the plant's details. There are also some text annotations in Vietnamese, which provide information