Come on, you must know more than just that.  There are loads of plants to know if you want to be known as a survivalist.  Edible plants, cordage plants, medicinal plants, &c.

Take clematis for instance; the bark can be used as cordage, tinder for firew by friction.  The actual plant can be used as a good hearth for fire-by-friction drills, and as a good fishing rod.
  Willow can be used as a headache cure (the bark, sap, and leaves contain the stuff that is the main constituent of aspirin), and saplings, suckers, &c, can be used as fire-by-friction drills and hearths, as well as arrows, and a lot of other wood uses.  Then there are edible plants: hawthorne leaves can be eaten, nettles leaves, once cooked, can be eaten, mallow thickens soups, and there are loads and loads of others.  Get out there with a field guide to plants and find some, and maybe get a good survival book that will tell you about edible plants.  And other uses, of course.

wow now i need a feild guide for sure or i can just guess and hope for the best

I prefer swamp milkweed in October, when the string or cord is at its peak in potential strength.

dont eat locoweed. it kills some people who hike in the Grand Canyon.

watercress is pretty decent

thats some of what i know about plants.

Mr.Knight

I only have a seventeen hundreds to about seventeen twenty view on making anything from flax.

You need to ret the flax, break it over the flax brake, i think crush it, then card, clean, and other such grooming procedures to it, then you need a drop spindle and some braidin g knowledge, and some beeswax.

i suppose that summarizes it, at least what i doa nyway

Have you got flax growing near you?

  I find that the best survival guide is Ray Mears Outdoor Survival Handbook, at least, in Europe.  It contains all the information you need to live (not just survive) primitively in northern Europe, and it contains lots of stuff about plants.
  And no, you can't just guess what plants do what.  Or maybe you could, but.... it would be incredibly difficult.
  Bushcraft by Ray Mears is also very good.  Lots of good information, and not just for Europe, but the world.  The problem is that it is not geared towards living in the wilderness, rather, hiking through it.
  And there is a good book about plants on www.hollowtop.com, Botany in a Day or something like that.  One of my friends has it, and it seems good.  I might buy it someday.
  Oceanspray seems like a nice plant.

i have three ray mears books the best one is his first one the survival handbook its more about living in nature than surviving what i do is primitive living skills not survival what i and i suppose english do is all about living in confidence and harmony with nature rather than 'pitting myself against nature and fighting the elements in the mear struggle to survive' and all that crap. I go on hollowtop .com a bit and he says it all better than i ever can.Anyway when spring coms around get some woodsorrel down your gullet lovly apple tastle they say not to eat too much because of the acid in it but iv  eaten handfulls of the stuff and never sufferedc any bad effects, burned or dryed coltsfoot ground up makes salt substutut and shepards purse makes a good pepper substutut jack by the hedge makes a good garlick flavour , and steamed beech leeves are nice sandwich fillers, lightly crushed reed stems left for a few days depending on the moisture makes a sugery gum