swallow-wort

Short definition from Wiktionary

Noun

1. 1
   A plant of any of several species of plants whose parts resemble a swallow's tail: Plants of genus Vincetoxicum, especially Vincetoxicum nigrum (syn. Cynanchum nigrum, black swallow-wort) or (Vincetoxicum hirundinaria (syn. Cynanchum vincetoxicum, white swallowwort).
2. 2
   A plant of any of several species of plants whose parts resemble a swallow's tail: Plants of genus Cynanchum
3. 3
   A plant of any of several species of plants whose parts resemble a swallow's tail: Chelidonium majus (greater celandine).
4. 4
   A plant of any of several species of plants whose parts resemble a swallow's tail: Pattalias palustris (syn. Seutera angustifolia, Gulf Coast swallow wort).
5. 5
   In genus Asclepias (milkweed): orange swallow-wort (Asclepias tuberosa)
6. 6
   In genus Asclepias (milkweed): silky swallow-wort (Asclepias syriaca
7. 7
   A plant of any of several species of plants whose parts resemble a swallow's tail: Calotropis spp. (giant milkweed).
8. 8
   A plant of any of several species of plants whose parts resemble a swallow's tail: Euphorbia maculata (spotted spurge).
9. 9
   Alternative form of swallowwort.