non-vascular
/nɒnˈvaskjʊlə/adjective
1 Medicine. That does not contain blood vessels (or, rarely: lymphatic vessels); that has not undergone vascularization; that does not have a blood supply. Also: that does not involve or belong to blood vessels; that is not caused by (disease of) blood vessels.
2 Botany. That lacks conducting tissue (xylem and phloem).
Origin
Mid 19th century; earliest use found in Philosophical Transactions of the Royal Society of London. From non- + vascular.