No thorns, but there does seem to be ample pollen at the center of the flowers. k5 runs a search on his internal database/reference books and while there isn't anything specifically identifying the plant, he comes across some matches from another source: the gardening club logbook from the school that Merlin and Armin had investigated before.

Again, there are not specific plants named, but a member did manage a decent drawing of the flowers in question, and there are notes about it having a calming effect that just barely offsets the frustration of how hard it is to grow. According to the notes, the flowers only bloom for a day or so once a month, though they don't always survive to the next month's bloom. Maybe they're being overwatered? The club members were pretty Okay at watering their plants, but maybe Okay is too much. They've been propagating the plant by stem cuttings, which had been a hit-or-miss, but overall doesn't seem to have been a priority for the club.