Compound plants in the VMS ?

[pedestrian]

If you mean the line separating root from stem

That's an interesting blog post which I hadn't read before, thank you. But the separating line wasn't exactly what I meant.

a) some plants have roots and stems that are roughly continuous, whether the colour changes or there's a separating line drawn on afterwards or not, e.g. f40v:
   

b) some plants have stems that appear to emerge from roots which are larger than the stems, but which nevertheless seem to be an 'organic' part of the plant altogether, e.g. f26r:
   

c) some plants have roots which are larger than the stem and the root appears to have been cut off flat and the stem(s) inserted into the cut off flat top of a larger root (as tends to be the case when grafting), whether they have the separating line, e.g. f19v:
   

or whether they don't have the separating line on the stem, e.g. f39V:
   

(These are probably not the best examples of each category).