The plant species commonly used for production of bioethanol is zea mays ,specially corn grain.

Selection of Plant Species for Bioethanol Production:

Zea mays (Corn):
- Corn is a widely used feedstock for bioethanol production due to its high sugar and starch content.
- The process involves converting the starch in corn into sugars which are then fermented into ethanol.
- Corn is a highly efficient source of bioethanol and has a well-established production infrastructure.

Jatropha:
- Jatropha is a promising plant species for bioethanol production due to its high oil content.
- The oil extracted from Jatropha seeds can be converted into biodiesel, while the by-products can be used for bioethanol production.
- Jatropha is a drought-resistant plant, making it suitable for cultivation in arid regions.

Pongamia:
- Pongamia is another plant species that shows potential for bioethanol production.
- The oil extracted from Pongamia seeds can be used for biodiesel production, with the by-products utilized for bioethanol production.
- Pongamia is a versatile plant that can grow in a variety of soil types.

Brassica:
- Brassica species, such as rapeseed and mustard, can also be used for bioethanol production.
- The oil extracted from Brassica seeds can be converted into biodiesel, while the by-products can be utilized for bioethanol production.
- Brassica plants are known for their fast growth and high oil content, making them a valuable feedstock for biofuel production.
In conclusion, while all the mentioned plant species have potential for bioethanol production, Zea mays (Corn) is the most commonly used and efficient feedstock due to its high sugar and starch content. However, Jatropha, Pongamia, and Brassica species can also be considered depending on factors such as availability, sustainability, and local growing conditions.