Cat's Claw Vine...Drought Tolerant, pretty flowers. Easy to grow from seed. Here is some info I found on the internet:

Beautiful and easy to grow in Full Sun and drought tolerant. ( Bignoniaceae ). Attractive evergreen climbing vines that give a display of bright yellow blossoms. Cats claw is a good ornamental cover for fences or walls, or of growing across lattice for shade. It will take full sun. It is a fast grower, with stems 10 to 18 feet long. The older stems of the Yellow Trumpet Creeper vine are red to brown similar to tree bark. The younger stems are bright green in color, and then as they get older they become woody up to about 6 inches thick. The leaves are divided into a glossy green, 3 tip leaflet with a two ovate-lanceolate, glossy green cladodes about 2 inches long per petiole and a 3 pronged claw-like climbing appendage. The yellow trumpet flowers are single or in small clusters, bright, and up to 3/4 inches long with 5 petals. They turn into a thin capsule fruit about 12 - 18 inches long which is green ripening to brown in late summer, developing winged seeds. It has tuberous, deep, extensive roots. It's seeds are dispersed by wind and water. Formerly known as Doxantha unguis-cati or Bignonia tweediana. With regular watering cat claw ivy will flower from April through September but the vine itself can live in 100+ degree weather for months without water. Maximum Height to about 25 feet. Equal or greater spread. Usually about 10 to 18 feet tall and long. The Very Bright yellow trumpet shaped flower is approximately 2 inches long, 1-1/4 inch diameter. The leaves are dark green, ovate-lanceolate, 2 inches long, entire or lower ones irregularly pinnately divided and a 3 pronged claw-like climbing appendage. The desert flower turns into a very long thin seed pod, 12 - 18 inches and about 1/2 inch wide. It has winged seeds about 4 Ã 1 cm in size. Yellow flowering cat's claw vines grow well in elevations from 0 to 2,500 Feet above sea level. A Xeriscape Desert Landscape plant. It's habitat is native to Brazil and Argentina but grows extremely well in the dry hot regions of North America. Whether you call it cat's claw or yellow trumpet vine, this plant produces a bright sunshine flower that brightens many a fence and house each spring and needs no care after the first 6 months. Let's just say it grows. And grows. And grows. Someone from Arizona wrote on a plant blog that it is "probably the finest climbing vine for covering a cinder block wall." Ideally suited for Climate Zone 10 but the sharp, cat-like claws allow it to grip and totally cover anything from California to Florida!