Lepidium densiflorum Schrad.  

Family: Brassicaceae

babyseed pepperweed, more...bigseed pepperweed, peppergrass, tall pepperweed

[Lepidium densiflorum var. densiflorum Schrad., moreLepidium densiflorum var. elongatum (Rydb.) Thell., Lepidium densiflorum var. macrocarpum G.A. Mulligan, Lepidium densiflorum var. pubecarpum (A. Nelson) Thell., Lepidium densiflorum var. ramosum (A. Nelson) Thell., Lepidium densiflorum var. typicum Thell., Lepidium elongatum Rydb., Lepidium neglectum Thell., Lepidium pubecarpum A. Nelson, Lepidium ramosum A. Nelson]