This lil guy shows up this year in my perennial garden ... any ideas ??? I'm in NW Montana near Kalispell

Looks like Orach (Atriplex hortensis)

huh ... I will have to look closer for more 'mountain spinach' ... we are definitly in the mountains here at 3700ft ... very hard to believe its windblown or local escapee but its here ... all seeds will be collected for next year ...