Twining snapdragon. The genus contains one species of perennial herb cultivated for its trailing habit and abundant, pale yellow snapdragon-like flowers. The leaves are almost heart-shaped and slightly pubescent, and creep vigorously along the earth in well-drained soils. Use to excellent effect in rock gardens or containers, but beware its robust vigor as it may quickly outpace companion plants. Best in full sun to part shade with regular to moderate water. Hardy to 0F.