|This garden and ornamental plant, which is from
China and Japan (Grubber 1991, 39*), has
occasionally been described as a euphoriant,
although its use is "strongly unadvised" (Schuldes
1995, 41*). When smoked, the dried leaves and
flowers are said to have effects similar to those of
marijuana (see Cannabis indica). The leaves
contain the isocoumarin hydragenol, which has
been linked to contact allergies (Roth et al. 1994,
411 *). Other constituents include a substance
known as hydrangin, saponins, and hydrocyanicacid compounds (Gottlieb 1973,20*).
Takeda, Kosaku, Tomoko Yamashita, Akihisa
Takahashi, and Colin F. Timberlake. 1990. Stable
blue complexes of anthocyanin-aluminium-3-pcoumaroyl-
or 3-caffeoyl-quinic acid involved in
the blueing of Hydrangea flower. Phytochemistry29 (4): 1089-91.