Acer palmatum 'Emperor I' (Emperor I Japanese Maple)
A fine newer cultivar distinguished by its bright red foliage. Whereas the more widely available cultivar, 'Bloodgood' has a maroon color, this one is redder, especially when the sun shines through the leaves. Hardy - leaves emerging two weeks later than 'Bloodgood'. Milwaukee, WI city arborists consider 'Emperor I' hardy within their urban area.
Acer palmatum 'Red Dragon' (Red Dragon Japanese Maple)
Unlike most "red" selections that are in fact purple this is more true red. Its color remains vibrant throughout the summer. Smaller than most dissectums, with black bark and a slower growth habit, this maple is a good choice for bonsai or a container.
Acer palmatum 'Tamuke yama' (Tamuke yama Japanese Maple)
Although not as lacy or fast growing as some clones, this laceleaf maple holds its dark purple-red leaf color better than others and is especially vigorous in hot climates. Spring color is crimson and fall color is scarlet.
Corylus avellana 'Red Dragon' (Red Dragon European Filbert)
From Shawn Mehlenbacher's work here at OSU comes a prized, blight-resistant, contorted, red-leaf hazelnut. With moderately contorted growth, it has an arching grace. Its purple color is intense in spring and early summer, and still dark later in the year. These are expensive but worth it; they will attract a lot of attention at garden centers.