Scientific: Clytostoma callistegioides (also known as Bignonia callistegioides)
Common: violet trumpet vine
Family: Bignoniaceae
Origin: Brazil and Argentina

Pronounciation: klii-to-STO-ma cal-li-steg-i-o-I-deez

Hardiness zones
Sunset
9, 12-24
USDA 9-11

Landscape Use: Trellis, arbor, pergola, wall cover, green wallscapes, or sprawling ground cover. In Phoenix, it should be used in mesic or oasis landscape design themes amongst other greenry.

Form & Character: Evergreen, lush when in leaf and festive when in bloom, subtropical to tropical in appearance Spanish architecture.

Growth Habit: Woody, evergreen perennial vine, vigorous from 20 to 50 feet.

Foliage/texture: Bi-foliate leaf with tendril; medium texture.

Flowers & fruits: Large, tubular, lilac blue flowers, white to yellowish throat with prominent floral  violet veins; fruit a brown capsule producing winged seeds.

Seasonal color: Cool violet-blue flowers mostly in spring and summer.

Temperature: Heat loving and moderately cold tolerant to 20o to 25oF.

Light: Full eastern sun to partial shade.

Soil: Tolerant

Watering: Irrigate regularly in Phoenix.

Pruning: Limited pruning except may need pruning to control spread.

Propagation: Semi-hardwood cuttings in summer root easily.

Disease and pests: None

Additional comments: Rarely found in Phoenix, though surprisingly well adapted to the lower desert if given ample water. In any event, this plant has a common name that is just way too cool.