in Tucson, Phoenix,
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Callaeum macropterum: Hillyhock / Yellow Orchid Vine

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Form: Twining vine.
Lifespan: Perennial.
Leaf retention: Deciduous at 25°F.
Growth rate: Moderate to rapid.
Mature Size: 15-25' long.
Flowers: Yellow, five petals shaped like ping-pong paddles.
Bloom: Late spring into early summer, then sporadically to fall.
Fruit: Seed pod, 1.5" wide, greenish papery wings aging to tan. When mature seed pod is broken apart, papery wings resemble butterflies.
Leaves: Green, smooth, 2" long by 1" wide.
Stems: No thorns. Needs support of a fence or trellis to climb.
Wildlife: Attracts bees, birds.
Toxic / Danger: All parts are toxic.
Origin: Baja California, Mexico.

Cultivation and Uses
USDA hardiness zones: Evergreen in 9b-10. Root hardy in 8b-10.
Heat tolerant: Yes.
Drought tolerant: Yes.
Sun: Full sun.
Water once established: Once or twice a month. Better appearance with weekly watering.
Soil: Well drained, dry, pH 6.1-7.8 (slightly acidic to slightly alkaline).
Mulch: In fall to protect roots down to 15°F.
Prune: In winter to control size.
Litter: Low. Some flower and pod drop.
Propagation: Seed and cuttings.
Uses: Ornamental.

Former scientific name Mascagnia macroptera.

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Callaeum macropterum: Hillyhock - flowers

Callaeum macropterum: Hillyhock - green seed pods

Callaeum macropterum: Hillyhock - ripe seed pods

Callaeum macropterum: Hillyhock vine