Clematis integrifolia is not strictly speaking a climber, more of a scrambler. It is herbaceous, and grows well as cover for a fence, growing to a maximum of two or three metres. It tolerates dry conditions but does need occasional deep watering and would probably not succeed in hot gardens, unless in a shady relatively moist spot. Its flowers are slightly fragrant. It comes easily from seed, and is quite variable. The picture shows one we grow, with wavier-edged flowers than usual; our seed was originally said to be of a form of Clematis crispa found in Texas, but in that species the sepals are joined together forming an urn, and in this they are entirely separate, so I believe it to be of a good form of C. integrifolia instead - I'd be very glad to hear from you if you disagree!