Clematis ligusticifolia

Clematis ligusticifolia Nutt.
Engl.: western white clematis, yerba de chivato, old-man's-beard, pepper-vine, virgin's-bower, western clematis, western virgin's bower, wild sarsaparilla.
Bot. syn.: Clematis neomexicana Woot. & Standl., Clematis suksdorfii B. L. Robins.