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tear-thumb
tear-thumb n.
Brit. 
/ˈtɛːθʌm/
, /ˈtɛːθʌm/U.S. /ˈtɛrˌθəm/
two species of Polygonum native to North America (and Asia), the halberd-leaved tear-thumb, P. arifolium, and the arrow-leaved, P. sagittatum; so called from the hooked prickles on the petioles and angles of the stems./ˈtɛrˌθəm/ΘΚΠ
the world > plants > particular plants > plants and herbs > according to family > Polygonaceae (dock and allies) > [noun] > bistort and allies
adderwortOE
arsesmarta1300
persicarya1400
persicaria?a1450
polygonya1500
buckwheat1548
polygonum1562
passions1568
bistort1578
oysterloit1578
goat's wheat1597
peachwort1597
plumbago1597
redshank1597
snake-weed1597
dragonwort1656
smartweed1787
patience dock1796
red-legs1820
passion dock1828
smartgrass1837
mud knotweed1845
jointweed1866
tear-thumb1866
pinch-weed1883
knotweed1884
sachaline1901
1866 J. Lindley & T. Moore Treasury Bot. Tear-thumb.
1926 W. Virginia Legislature Hand Bk. 488 Do you see among those [wild flowers] present, any exotics?.. Yes..This bit of smart-weed or tear thumb.
1978 C. B. Dugdale Mod. Amer. Herbal II. 124 Tearthumb; Arrow-leaved Tearthumb... The small cluster of flowers varies in color from pinkish to whitish.
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