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Passiflora caerulea
A type of passionflower but not sure the sub species
growing in my friends side yard, it took over one of their trees and is growing all over their fence
Passiflora serratifolia is hardy in zone 9-11. You may be in that range near Houston. The leaf is a single saw-edge-leaf; thus the common name of saw leaf passionflower. I cannot accurately see the number of lobes on your plant, but it is not a single saw-edge-leaf; so it does not match the suggestion above. The native passiflora incarnata has a 3 lobed leaf. The non-native passiflora caerulea that is common in Texas has a 5 lobed leaf.