Vincetoxicum nigrum

{
  "id": "MLC-T-ENV-029725",
  "term": "Vincetoxicum nigrum",
  "field": "Environment",
  "definition": "Black or Louis’ swallow-wort (previously Vincetoxicum nigrum and Cynanchum nigrum) is a perennial, twining herbaceous vine. The leaves are oval shaped with pointed tips, 3-4 in. long by 2-3 in. wide, and occur in pairs along the stem. The small five-petaled star shaped flowers are dark purple to almost black with white hairs, about ¼ in. across, and are borne in clusters. The fruits are slender tapered pods, 2 to 3 in. long by about ¼ in. wide, turning from green to light brown as they mature. Plants have rhizomes (underground stems) that sprout new plants and grow in clumps of several to many stems, forming extensive patches.",
  "subject": "Biological substances",
  "references": [
    "National Park Service Plant Conservation Alliance at http://www.nps.gov/plants/alien/fact/cylo1.htm"
  ],
  "url": "https://mlchart.com/terminology/environment/vincetoxicum-nigrum/"
}