Tips on growing clematis--did you know they can't climb wooden trellises? They don't twine; they wrap, so any support thicker than 1/2 inch won't work. Use twine or trellis netting to give the illusion of climbing on your wooden trellis.
Rhodochiton atrosanguineum (AGM) Purple Bell Vine is a deciduous perennial climber with heart-shaped leaves and twining leaf stalks. It bears pendulous tubular deep maroon flowers with bowl-shaped rose-red calyces in Summer and Autumn. It can make a height of 1.5/2.5m but only 1m in spread making it a good candidate for a pergola as shown in this picture. It likes a position in full sun.