Which plant is characterized by its red stems and is known as Red-Osier Dogwood?

The plant known as Red-Osier Dogwood is accurately identified as Cornus sericea. This species is particularly notable for its striking red stems, which are especially prominent in the winter months, providing vibrant color contrast against the typically drab backdrop of a winter landscape. The red stems are not just ornamental; they also serve as an important ecological feature by providing habitat for various wildlife.

In addition to its aesthetic appeal, Cornus sericea is often used in landscaping and naturalized areas due to its adaptability to different soil types and ability to thrive in wet conditions. Its stems can be pruned back to encourage new growth, which enhances their vivid coloration.

The other plants mentioned do not share this specific characteristic of red stems. For instance, Amelanchier is known for its beautiful spring flowers and edible berries; Callicarpa bodinieri 'Profusion' is recognized for its stunning purple berries; and Cotinus coggygria, commonly known as smoke bush, is famous for its feathery plumes and vibrant foliage. These distinctions firmly establish Cornus sericea as the correct answer for the characteristic of red stems associated with Red-Osier Dogwood.