![](/nationalgeographic/trailblazer_november_december_2018/killer_seeds_and_the_sting_is_the_thing/192020/castor_bean_plant.640_0_1.png)
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KillerSeeds
Spiky,reddishflowerssitalongthebanksofanAfricanriver.Agentlewindblowstheirripe,purplish‑brownseeds.Sometumbletothe ground.
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![Gulp!](/nationalgeographic/trailblazer_november_december_2018/killer_seeds_and_the_sting_is_the_thing/192013/castor_beans.640_0_1.png)
Castorbeansarethedeadlypartoftheworld’smostpoisonous plant.
Ahungrybirdwandersby.Thecastorbeanseedssparkle.But,thebirdwillnoteattheseseeds.Itknowstheycan kill.
CastorbeanplantscamefromAfrica.Nowtheyaregrowningardensaroundtheworld.Theplantisbeautiful.But,itisfullof poison. A smallhandfulofseedscankillaperson.Yet,theplantneedsthispoison.Itprotectstheseedsfrombeingeatenby animals.
TheStingIsthe Thing
It’smorninginarainforestinAustralia.Sunlightshinesacrosssomeheart‑shapedleaves.Eachleafofthegympie‑gympietreeiscoveredwithsparkling fuzz.
Watchout!Thefuzzismadeupofneedle‑likehairs.Eachisfilledwithapainfulpoison.Touchtheplant,andyou’llgetstung.Thehairsenteryourskinandbreakoff.Theyare trapped.
Someanimalscaneattheseleaveswithnoeffect.But,humanscansufferaterriblepain.Theplantdoesn’tdolastingdamage.Still,it’sbesttowashtheneedlesfromtheskinright away.
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![Ouch!](/nationalgeographic/trailblazer_november_december_2018/killer_seeds_and_the_sting_is_the_thing/192014/gympie_gympie_ouch.400_0_1.png)