Are you sure it is 50days into flowering? Or vegging maybe?

That is quite odd not to have any trichs then. I'm guessing that it is possibly a long term flowering plant. Is it sativa at all? I have heard of some sativa dom. strains taking over 100days to finish flowering. What kind of lighting are you using? Low wattage lighting, or improper lighting, during flowering will greatly slow things down. I've seen some plants take 4 weeks into flowering before they see a single pistil.

But if you have proper lighting and all, and it isn't a sativa dom. strain, then yes, that is quite odd