The bloom of Clematis sent is undoubtedly C. Jackmannii. We are not surprised to find you writing of it in such warm terms of praise. The straggling habit of your plant is no doubt traceable to the fact that the old wood was not cut away last autumn. In November give the roots a good dressing of decayed manure; and in the spring, say February, just as the buds begin to swell, cut it back to within 6 inches of the ground. You will be astonished at the growth it makes in one season when so treated.