Asian clematis

C. stans is a woody-based herbaceous perennial, 0.7-1.5m high, with green leaves composed of three toothed leaflets, and tubular flowers, with a scent like lily-of-the-valley, and composed of four white, off-white or pale blue sepals, 1-3cm long, which curl backwards at the tips, and cream anthers, from late summer to autumn; many clematis are visited by bees for pollen, and some also provide nectar