What is a word for 'plant roots'(note the plural) that also means lineage?

Question

I am doing a crossword for 5 extra percent in my university biology class...it's harder than you would think and I only have this and one other word left.

Thanks!

Answer 1

Phylogeny is the lineage of an organism

phylo from phylon 'stock or race'  plus geneia origin

The prefix phyto means plant