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These two plants appeared after a very wet winter. No flowers have ever appeared, but it looks like it is making a lot of big seed heads. I am thinking to pull it before it drops its seed. It is in full sun, and seems to be somewhat drought tolerant. Central Oregon. Photos taken a month ago, now seeds are bigger but no other real changes. enter image description here

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    Agree E. lathyris - its pops up on its own, common name Caper spurge, where there's one, there'll be several next year, best pulled out, but wear gloves - the sap can be highly irritant to some people's skin.
    – Bamboo
    Commented Jul 27, 2017 at 20:32

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It seems Euphorbia_lathyris . For sure it is an Euphorbia, with such inflorescence.

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  • Thanks for the identification and link! It appears the plant is poisonous. Out it goes!
    – NaniBly
    Commented Jul 28, 2017 at 16:28
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Looks like it is Gopher Spurge. https://gobotany.newenglandwild.org/species/euphorbia/lathyris/

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