hey man check this out its from the cannabis breeders bible by greg green: chapter 16. CHROMOSOME MODIFICATIONS IN CANNABIS:
trilateral branching is common with south american sativa strains
instead of two branches -one at each side on the stem,180 degrees
apart- a third branch develop at the same region but the stem does not
split or top itself. the thrid branch may be on one side or the other, or the
three branches may be 120 degrees apart from one another. this popular
mutation has pick up the name "whorled phylotaxy" coming from the word
whorled:an arrangement of three or more similar parts or organs at the
same level about an axis and phylotaxy:the arrangemment of leaves or the
other lateral members on an axis or stem.....
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thats all it has about it man, i bet a google search can find more....