*extrorsal*

{ } a. [ L. dextrorsum, contr. fr. dextrovorsum, dextroversum, toward the right side; dexter right + versus, vorsus, p. p. of vertere, vortere, to turn. ] (Botany) Turning from the left to the right, in the ascending line, as in the spiral inclination of the stem of the common morning-glory; as, dextrorse vines. [ 1913 Webster ]

☞ At present scientists predicate dextrorse or sinistrorse quality of the plant regarded objectively; formerly the plant was regarded subjectively, and what is now called dextrorse was then considered sinistrorse. [ 1913 Webster ]