One of the mysteries of the English language finally explained.
1A plant of the milkweed family, the follicles of which suggest a swallow with outstretched wings, often becoming a weed.
Several species in the family Asclepiadaceae, in particular the European black swallow-wort (Cynanchum or 'Vincetoxicum' nigrum), and the American Asclepias curassavica
- ‘Black swallow-wort is difficult to control and has been noted to invade prairie areas.’
- ‘Although both swallow-worts share the ominous ‘dog-strangling’ moniker, they're actually a threat to Monarch butterflies.’
- ‘During the last two decades, the invasive exotic vines pale swallow-wort and black swallow-wort have become a major problem in New York State.’
- ‘The key is education so that people can recognize swallow-wort in it's early stages, and awareness about it's devastating effects so that it will be taken seriously.’
- ‘We are studying the impacts and control of infestations of the swallow-worts (Vincetoxicum nigrum’
- ‘This talk will begin by briefly introducing the biology of swallow-worts and the current management techniques used by locals.’
- ‘The fifth edition of Gray's Manual of Botany reports black swallow-wort to be a weed escaping from gardens in the Cambridge Massachusetts area.’
- ‘This presentation will focus on patterns of host use by these herbivores within the genus Vincetoxicum and address their potential effectiveness as biocontrol agents of swallow-worts in North America.’
- ‘My current research at Cornell seeks to increase knowledge about the biology/ecology of two introduced species of swallow-wort [pale swallow-wort and black swallow-wort].’
- ‘If you search for black swallow-wort on the Internet, you will find several web sites dedicated to telling you how to rid your property of this plant.’
- ‘Pale swallow-worts invade a wide variety of habitats including old fields, open woodlands, pastures, roadsides, and floodplains.’
- ‘Where found in Wisconsin, black swallow-wort has spread widely, creating rapidly growing mats of tangled vines.’
- ‘Studies have shown that when the monarchs lay their eggs on pale or black swallow-wort, the larvae die within three days.’
- ‘Research shows that the butterfly will cue into black swallow-wort and lay eggs, but the larvae do not survive.’
- ‘Two soil types, from areas dominated by pale and black swallow-wort, will be placed in pots and the pH adjusted to one of three different pH conditions.’
- ‘The purple-flowered black swallow-wort prefers open areas and have a foothold in the Hudson Valley, Long Island, southern New York and the New England coast.’
- ‘First up this weekend is an interesting post at Science Notes about the three invasive swallow-worts that are problems in North America.’
- ‘To date, the two thug swallow-worts have spread to at least 20 states and several Canadian provinces.’
- ‘They found eggshells as evidence of monarch oviposition on black swallow-wort in uncaged field populations of swallow-wort and milkweed.’
- ‘The purple-flowering black swallow-wort spreads rapidly in open areas and is found in New York's Hudson Valley and on Long Island, and throughout New England.’
2British The greater celandine, formerly believed to be used by swallows to restore their sight.
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