Which species is known as Red Horsechestnut?

The species known as Red Horsechestnut is Aesculus x carnea. This hybrid tree is recognized for its striking display of red or pink flowers that bloom during the spring, making it a popular ornamental choice for landscaping. Its broad, palmate leaves and overall architecture add further aesthetic value to gardens and parks.

In contrast, the other choices listed do not relate to the Red Horsechestnut species. For instance, Acer platanoides is the Norway Maple, which is known for its adaptability and vibrant fall color, but it does not produce the characteristic flowers of the Aesculus x carnea. Cercidiphyllum japonicum, known as the Katsura tree, is appreciated for its heart-shaped leaves and fragrance in the fall, but it belongs to a different family entirely. Lastly, Betula jacquemontii, commonly known as the Himalayan Birch, is distinguished by its white bark and is valued for its ornamental qualities, not for any resemblance to the Horsechestnut.

Thus, Aesculus x carnea is appropriately identified as the Red Horsechestnut, noted for its unique flowering and ornamental attributes, setting it apart from the other species mentioned.