a prefix used freely in English and meaning "not, lack of," or "sham," giving a negative sense to any word, 14c., from Anglo-French noun-, from Old French non-, from Latin non "not, by no means, not at all, not a," from Old Latin noenum "not one" (*ne oinom, from PIE root *ne- "not" + PIE root *oi-no- "one, unique"). In some cases perhaps from Middle English non "not" (adj.), from Old English nan (see not). "It differs from un- in that it denotes mere negation or absence of the thing or quality, while un- often denotes the opposite of the thing or quality" [Century Dictionary].
1670s, in anatomy, "pertaining to conveyance or circulation of fluids," from Modern Latin vascularis "of or pertaining to vessels or tubes," from Latin vasculum "a small vessel," diminutive of vas "vessel."
<a href="https://www.etymonline.com/word/non-vascular">Etymology of non-vascular by etymonline</a>
Harper, D. (n.d.). Etymology of non-vascular. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/non-vascular