Horsetail (was "Plant Without a Name")

This horsetail (Equisetum) has the look and texture of grass, but knots on its stalks remind me of bamboo. I'm not sure which species it is; it looks like water horsetail but the one we have

• doesn't grow on wet land, and
  
• 1/3 of them are taller than 140cm (some of them are even taller than 170cm) .

My watercolor brushes arrived today, so of course I had to try them out. Not knowing much about watercolor painting, I went for the easiest plant (mostly drawing, not much painting) to test my brushes. I didn't control my lines well and each branch was thicker than the real thing. To fix my mistake, I used a brown technical pen to "trim" the branches down, but apparently it was a bad move.

Watercolor painting, my next frontier.

Media: watercolor, technical pen.