(n.) A genus of coarse biennial herbs (Lappa), bearing small burs which adhere tenaciously to clothes, or to the fur or wool of animals.

Canada thistle DET DMT LSD Mary Jane STP THC abate abrade abstract acid amphibian angiosperm annual antidepressant aquatic plant ataractic backset bate biennial black sheep blemish bones boo brake burdock burr cannabis chaff chicory cosmopolite crab grass creeping buttercup culm cultivate culture curtail cut cutting dandelion deadwood deciduous plant decrease deduct delve depreciate derogate detract dicot dicotyledon diethyltryptamine dig dimethyltryptamine diminish dishwater disparage dock draff drain dregs dress dust eat away ephemeral erode evergreen exotic extract fallow fertilize file away filings flowering plant force foreign body foreign intruder fungus gage gametophyte ganja garbage gash grass gymnosperm hallucinogen harrow hash hashish hay hemp hoe hogwash horsetail husks hydrophyte impair impurity intruder jimsonweed joint kava leach leavings lees lessen list mallow marijuana mescal mescal bean mescal button mescaline milkweed mind-altering drug mind-blowing drug mind-expanding drug misfit monkey wrench monocot monocotyl morning glory seeds mote mulch mustard nettle oddball offal offscourings orts parings perennial peyote plant plantain plow poison ivy poke pokeweed polycot polycotyl polycotyledon pot potsherds prune psilocin psilocybin psychedelic psychic energizer psychoactive drug psychochemical psychotomimetic purify rags rake raspings reduce reefer refine refuse remove retrench roach rub away scourings scrap iron scraps scum seed plant seedling shards shavings shorten slack slag sliver slop slops spade speck spermatophyte splinter sporophyte stick stone stubble subduct subtract sweepings swill take away take from tares tea thallophyte thin thin out thistle till till the soil tranquilizer triennial vascular plant vegetable wastage waste waste matter wastepaper wear away weed out weeds withdraw work