PlantsFlowering PlantsSlimpods, Milkweeds & relatives — Family Apocynaceae
Vine or herb. Leaves simple. Corollas (petals) with 5 lobes and calyces (sepals) with 5 lobes. 5 stamens.
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Bluestar — Genus Amsonia
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Dogbane — Genus Apocynum
Antelope-horns
Milkweeds — Genus Asclepias
Leaves alternate, opposite, or whorled.
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Madagascar Periwinkle —  Catharanthus roseus [1]
Bluevine
Swallow-wort — Genus Cynanchum
Vines. Leaves opposite, simple.
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Twinevine — Genus Funastrum
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Cockroachplant —  Haplophyton crooksii [1]
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Rocktrumpets — Genus Mandevilla
Two-flower Milkvine
Milkvine — Genus Matelea
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Oleander —  Nerium oleander [1]
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Silkvine —  Periploca graeca [1]
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Climbing Dogbane —  Trachelospermum difforme [1]
Common Periwinkle
Periwinkle — Genus Vinca
Evidence that species is found in Texas:
  1. USDA Plants Database, advanced search for Texas plants from the United States Department of Agriculture.