Dr. Peter MacOwan (1830-1909).**
-anus, = belonging to, connected with, pertaining to, used to form adjectives from nouns, particularly from geographical and personal names. (Ch, La)
sarpo, = to cut off, trim, prune, clean;
sarmentum, = twigs, light branches, brushwood; a faggot, fascine;
-osus, = indicates abundance or full or marked development.
sarmentosus, = full of twigs or little branches.
(producing long runners) (ld, BL)