Knowledge (XXG)

Symphytum officinale

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that are fused into a tubular or narrowly bell-shaped corolla with pointed, recurved teeth that are 2 millimetres long. Petals come in mainly two colours – typically cream to yellow or pink to purplish. Inside are 5 stamens and 1 stigma. The calyx has a tubular segment of about 2 millimetres and narrow, pointed teeth of about 4 millimetres. The fruits are segmented into 4 egg-shaped, shiny black nutlets that are 5–6 millimetres long. The plant produces significant nectar when compared to other UK plants tested. Although, it has a long tube, meaning only insects with long tongues can reach the nectar, some bees have been known to bite into the side of the flower to access the nectar – a foraging behaviour known as
46: 327:. The internally white roots are covered with black bark. Above ground the plant is covered in long, downward-pointing, tapering hairs that are bristly on the stems and softer on the leaves. Along the erect stems grow large simple, mostly stalked leaves in an alternate pattern. They are oval-lanceolate and 4 to 25 centimetres long. In the upper parts they are narrower, without stalks, and with margins that extend down the stems. The 33: 343:
that are initially coiled and later open out. They bear two rows of hermaphrodite flowers on nodding stalks that are 2 to 6 millimetres long. The small flowers measure 8–20 millimetres in length and 12 to 18 millimetres across the corolla. The flowers are radially symmetrical with five equal petals
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Comfrey is found in moist grasslands or along riverbanks and ditches in western Asia, Europe, and North America. It is a perennial herb that is cold hardy down to −35 °C (−31 °F) and drought-tolerant. The plant can grow 1–5 feet (0.3–1.5 m) tall with branched, strongly winged stems.
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found the research quality was too low to allow conclusions about its efficacy and safety. In Europe as of 2015, there were no comfrey products for oral use, and those for topical uses to treat bruises or joint pain were evaluated as having risk of liver toxicity.
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banned the sale of comfrey products for internal use and use on open wounds due to its potential toxicities. A 2018 review on pyrrolizidine alkaloids present in comfrey indicated widespread potential toxicity to humans and
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Vogl, Sylvia; Picker, Paolo; Mihaly-Bison, Judit; Fakhrudin, Nanang; Atanasov, Atanas G.; Heiss, Elke H.; Wawrosch, Christoph; Reznicek, Gottfried; Dirsch, Verena M.; Saukel, Johannes; Kopp, Brigitte (2013).
1090:"Analysis of herbal teas made from the leaves of comfrey (Symphytum officinale): Reduction of N-oxides results in order of magnitude increases in the measurable concentration of pyrrolizidine alkaloids" 314:
of leaves and roots to treat sprains, bruises or bone fractures. Also the roots could be mashed then packed around a broken limb, when dried they formed a hardened 'plaster cast'.
1129: 364:, leaf bases are not decurrent, stem internodes are not winged, and the surfaces of the seeds are brown, dull, and finely granular instead of shiny black. Additionally, 1500: 992:"Ethnopharmacological in vitro studies on Austria's folk medicine—An unexplored lore in vitro anti-inflammatory activities of 71 Austrian traditional herbal drugs" 1088:
Oberlies, Nicholas H.; Kim, Nam-Cheol; Brine, Dolores R.; Collins, Bradley J; Handy, Robert W.; Sparacino, Charles M.; Wani, Mansukh C.; Wall, Monroe E. (2007).
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It is native to Europe, growing in damp, grassy places. It is found throughout Ireland and Britain on river banks and ditches. It occurs in North America as an
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which are toxic compounds readily absorbed via the stomach or skin, and have potential to increase the risk of fatal liver toxicity. In 2001, the US
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is generally more bristly, flowers later (between June and August), and its flowers tend to be more blue or violet.
1750: 1696: 1580: 45: 1536: 950: 441: 1616: 1298: 1239: 519: 1701: 869: 450:, also known as Blue Comfrey, or Russian comfrey, which is widespread in the British Isles, interbreeds with 1425: 1430: 1417: 1412: 1352: 1260: 511: 849: 162: 1456: 615: 328: 1603: 1373: 471: 233: 1801: 387: 232:(from the Latin confervere to 'heal' or literally to 'boil together', referring to uses in ancient 1554: 298:
Over centuries, comfrey was cultivated in Asia, Europe, and the United Kingdom as a vegetable and
1796: 1768: 279: 237: 186: 40: 1760: 1688: 1156:"FTC Announces a Second Case Focusing on Safety Risks of Comfrey Products Promoted via Internet" 772: 585: 1505: 1637: 1360: 1218: 1200: 1111: 1070: 1021: 969: 916: 890: 829: 801: 776: 675: 436: 392: 1642: 1479: 1208: 1190: 1101: 1060: 1052: 1011: 1003: 667: 528: 1624: 486:, an English herbalist (1545–1612), mentions "the slimie substance of the roote made in a 217: 83: 1130:"FDA Advises Dietary Supplement Manufacturers to Remove Comfrey Products From the Market" 1675: 654:
Van Der Kooi, Casper J.; Pen, I.; Staal, M.; Stavenga, D. G.; Elzenga, J. T. M. (2015).
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refers to its use for medicinal preparations. The official first formal scientific
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may be used with the intent to heal broken bones, giving it the name "knitbone".
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Moreira, Rute; Pereira, David; Valentão, Patrícia; Andrade, Paula (5 June 2018).
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A 2013 review of clinical studies assessing the possible effect of comfrey on
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Pflanzensoziologische Exkursionsflora für Deutschland und angrenzende Gebiete
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The root system has a pronounced, deep-reaching (up to 1.8 metres)
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use of comfrey is discouraged due to its strong potential to cause
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or tincture) or externally (as ointment, compresses, or alcoholic
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Comfrey is mildly toxic. Like most Boraginaceae, it contains
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Species of flowering plant in the borage family Boraginaceae
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Reader's Digest Field Guide to the Wild Flowers of Britain
855: 1041:"Topical herbal therapies for treating osteoarthritis" 596:. Greensboro, North Carolina: National Plant Data Team 701:"Assessment report on Symphytum officinale L., radix" 247:
To differentiate it from other members of the genus
1267: 819: 817: 850:Symphytum officinale L. s. l., Arznei-Beinwell. 339:The plant flowers from May to June with forked 870:"Which flowers are the best source of nectar?" 8: 828:(in German) (8 ed.). pp. 787–788. 1183:International Journal of Molecular Sciences 1158:. US Federal Trade Commission. 13 July 2001 1045:The Cochrane Database of Systematic Reviews 1255: 1039:Cameron, M.; Chrubasik, S. (31 May 2013). 224:. Along with thirty four other species of 31: 20: 1212: 1194: 1105: 1064: 1015: 763: 761: 759: 757: 755: 798:The Vegetative Key to the British Flora 739:Plant Finder, Missouri Botanical Garden 706:. European Medicines Agency. 5 May 2015 634:United States Department of Agriculture 625:Germplasm Resources Information Network 554: 552: 550: 548: 546: 544: 540: 482:) for treatment of various disorders. 897:. University of California, Berkeley. 796:Poland, John; Clement, E. J. (2009). 695: 693: 691: 689: 594:The PLANTS Database (plants.usda.gov) 7: 1751:b74e1b69-2896-4d13-bd2c-0000896288f6 1604:80c1eaa9-95b7-4dc9-90e0-f7285017db37 725: 723: 721: 286:. The flowers are mostly visited by 1250:University of California, Berkeley 430:A common hybrid is formed between 331:is 2n = 24, 26, 36, 40, 48 or 54. 14: 966:Comfrey: Past, Present and Future 964:Hills, Lawrence D. (2011-10-20). 1702:urn:lsid:ipni.org:names:120815-1 872:. Conservation Grade. 2014-10-15 310:, reflect its historical use by 44: 490:of ale" would help back pains. 913:New Flora of the British Isles 800:. Young Writers. p. 161. 259:. Other English names include 1: 630:Agricultural Research Service 996:Journal of Ethnopharmacology 516:Food and Drug Administration 506:Toxicity and adverse effects 423:(F. W. Schmidt) Čelak (syn. 1812:Taxa named by Carl Linnaeus 251:, this species is known as 1828: 891:"Symphytum key to species" 527:, and the opportunity for 403:Subspecies include subsp. 302:. Its early common names, 1057:10.1002/14651858.CD010538 1008:10.1016/j.jep.2013.06.007 951:Missouri Botanical Garden 824:Erich Oberdorfer (2001). 236:). Internal or long-term 192: 185: 168: 161: 41:Scientific classification 39: 30: 23: 1807:Plants described in 1753 520:Federal Trade Commission 1094:Public Health Nutrition 512:pyrrolizidine alkaloids 407:(A. Kern.) Nyman (syn. 380:The latin name epithet 352:Species differentiation 335:Inflorescence and fruit 531:from these compounds. 318:Description and botany 968:. Faber & Faber. 775:. 1981. p. 242. 400:, Tomus I, page 136. 1653:Symphytum_officinale 1594:Symphytum~officinale 1299:Symphytum officinale 1269:Symphytum officinale 1241:Symphytum officinale 1196:10.3390/ijms19061668 939:Symphytum officinale 733:Symphytum officinale 618:Symphytum officinale 588:Symphytum officinale 472:traditional medicine 468:Symphytum officinale 458:Traditional medicine 432:Symphytum officinale 390:appeared in 1753 in 234:traditional medicine 210:Symphytum officinale 196:Symphitum officinale 172:Symphytum officinale 25:Symphytum officinale 1136:on 14 November 2017 470:roots were used in 388:species description 1107:10.1079/phn2004624 280:introduced species 154:S. officinale 1784: 1783: 1638:Open Tree of Life 1261:Taxon identifiers 975:978-0-571-28091-9 922:978-0-521-70772-5 807:978-0-9560144-0-5 672:10.1111/plb.12328 562:. Drugs.com. 2018 474:internally (as a 411:auct. non Kern., 393:Species Plantarum 228:, it is known as 206: 205: 200: 1819: 1777: 1776: 1764: 1763: 1754: 1753: 1741: 1740: 1731: 1730: 1718: 1717: 1705: 1704: 1692: 1691: 1679: 1678: 1666: 1665: 1656: 1655: 1646: 1645: 1633: 1632: 1620: 1619: 1607: 1606: 1597: 1596: 1584: 1583: 1571: 1570: 1568:NBNSYS0000003984 1558: 1557: 1545: 1544: 1532: 1531: 1522: 1521: 1509: 1508: 1496: 1495: 1483: 1482: 1473: 1472: 1460: 1459: 1447: 1446: 1434: 1433: 1421: 1420: 1408: 1407: 1395: 1394: 1382: 1381: 1369: 1368: 1356: 1355: 1346: 1345: 1336: 1335: 1323: 1322: 1313: 1312: 1303: 1302: 1301: 1288: 1287: 1286: 1256: 1248:photo database, 1227: 1226: 1216: 1198: 1174: 1168: 1167: 1165: 1163: 1152: 1146: 1145: 1143: 1141: 1126: 1120: 1119: 1109: 1085: 1079: 1078: 1068: 1036: 1030: 1029: 1019: 986: 980: 979: 961: 955: 954: 933: 927: 926: 905: 899: 898: 895:Jepson Herbarium 887: 881: 880: 878: 877: 866: 860: 846: 840: 839: 821: 812: 811: 793: 787: 786: 765: 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Index


Scientific classification
Edit this classification
Plantae
Tracheophytes
Angiosperms
Eudicots
Asterids
Boraginales
Boraginaceae
Symphytum
Binomial name
L.
Synonyms
perennial
flowering plant
Boraginaceae
traditional medicine
topical
liver toxicity
introduced species
weed
bumblebees
herbal medicine
poultices
taproot
chromosome count
cymes
nectar robbing
officinale

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