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Callaeum macropterum

Callaeum macropterum
butterfly vine; orchid vine
Big chartreuse immature seed pods

Synonym(s) Mascagnia macroptera
Common name butterfly vine; orchid vine
Family malpighiaceae
Life cycle perennial (Z8-10)
Flowers yellow (late spring-fall)
Size vine to 15'
Light sun-part shade
Cultural notes well drained soil; drought-tolerant

Cheerful yellow flowers on a tough vine give way to butterfly-shaped seedpods. May stay evergreen in mild winters, and should be root hardy through zone 8. Native from Mexico through northern South America.
We planted ours in mid-fall, and watched it grow tentatively through the following spring, producing a few blooms. By summer, it started sprinting, climbing the fence and neighboring plants, with lots of flowers. But we didn't see the "butterfly" pods until early autumn. I'm not sure if that's typical, or if the right pollinator just didn't come along earlier in the year.
In the following years, it grew ever stronger, eventually claiming a substantial part of the back fence, as well as any tree and shrub daring to live to close by.

Callaeum macropterum
butterfly vine; orchid vine
Starting to colonize Green Man
Callaeum macropterum
Not yet blooming in mid-April, but nicely covering the fence

In our garden, this plant grows in the following area: back fence border

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