Preparation , Tincture of the plant when in flower. Authority. Dr. P. B. Hoyt, Am. Hom; Obs. XI, p. 101, effects of gathering a handful of the flowers (the same happened four years later, with addition of headache, and afterward again). Dull headache. Eyes began to water and burn, with slight itching (after fifteen or twenty minutes); this continued until I reached my boarding-house. I was suffering quite severely; my sister at once asked what was the matter with my eyes, and going to the glass, my eyelids were swollen and the sclerotica much injected, presenting fiery redness; there was some sensitiveness to light. These symptoms continued through the afternoon and evening, and kept me awake for some time; in the morning my eyelids were agglutinated, and on opening my eyes they were quite sensitive to the light; the burning and smarting were less, still my eyes discharged water more or less for two or three days; the symptoms gradually subsided, and in a week I was well again.