Found a lot on the largest island to the Southwest of the map of Ragnarok. This island isn't super dangerous just look out for the Thorny Dragons. These can be found running through water a lot but also on land. While you are mounted look for a fast moving dilo looking thing. Tamed a level 49 Microraptor with a tranq arrow and one rare flower. No narcs needed. Be careful as they can be killed with the arrows so go for a higher level. Excellent pvp shoulder mount since they can stun anyone off their mount. 52 fortitude was no match for one. They did not knock me out once off my mount and ran away from my 130 argentavis a lot.
I hear on standard servers it only takes 1 rare flower to tame a 150. I can confirm it does at 2.5 (5x old rates) rates at least. Also they look almost identical to Archas almost, especially at a distance or while mounted.