Ok back again after a few weeks with this mysterious plant. Did some backtracking and it is actually one that germinated back in late February, lived in greenhouse til mid March, then transplanted to the 18" pot outside where it has been since. I calculate it is approximately 18 weeks from seed. No sign of flowers other than so-called "pre-flowers". As you can see it continues to grow. I topped it to slow the vertical growth and cleaned up a lot of old single leaf fans. The branches have long since stopped being double nodes side by side but are all coming out stepped, veg stage looking. Still seeing pre-flower-ish activity.
I have to qualify that I am not a veteran grower other than random plants and successful harvests from back in the Colombian Gold days of the 70's. Once converted several acres of forgotten WWII hemp crop growing in a creekbottom into actually serviceable weed by gathering all the seeds I could from friends, of all varieties from the crappiest Mexican to one hit Gold and spreading them at exactly the time the wildwood weed was dropping seeds. I think it was total around 5 pound baggies of seeds. Did over a couple of seasons and suddenly there was a marked rise in potency and varieties growing in the creekbed. Did a lot of pruning, testing, manual crosspollinating during those summers. Did the whole rubbed hash thing and even experimented with iso2 machine and homebrew version.
Point is, I've seen a lot of different kinds and shapes of wild weed, and lots of kinds and shapes of commercial weed, but never anything like this animal. I thought it was a sort of Ruderalis at first, especially when it started getting early flowers, but it simply hasn't evolved. Very perplexing.
What sets it apart from other weed I have grown is that it is very dense. The stalk base is close to an inch thick, but the plant is only about 26" tall. It is a tangled, thick smelly mass of weed.
Could it possibly be some GMO strain designed to not reproduce ever?