Water Gardenia Fruit Classic Formulas

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Drains fire and relieves irritability - Shui Zhi is a water-gardenia variant used along the same general fire-clearing axis as Zhi Zi for vexation, heat agitation, and chest constraint.
Clears damp-heat - traditional use extends to jaundice, dark scanty urination, and damp-heat lodged in the Liver-Gallbladder or lower burner.
Cools blood and checks heat-related bleeding - bleeding from heat, blood-heat rashes, or hot painful swelling remain within its traditional use range.
Clears heat and relieves toxicity, but usually with less prestige than standard medicinal Zhi Zi - regional practice may still substitute it when authentic smaller-fruited material is unavailable.

Yin Chen Hao Tang lineage uses gardenia fruit to drain damp-heat jaundice, and Shui Zhi appears as a substitute or regional variant in that treatment logic.
Zhi Zi Chi Tang style formulas reflect the same chest-vexation and irritability application family for which Shui Zhi may be discussed comparatively.
Huang Lian Jie Du Tang lineages illustrate the broader role of bitter-cold gardenia fruit in systemic fire-toxin clearing.

Me and Qi's identity guidance for Zhi Zi specifically notes Shui Zhi Zi as a larger, more elongated water-gardenia substitute that differs from the preferred medicinal grade.
Analytical and sourcing literature treats Shui Zhi or Shui Zhi Zi as a real gardenia variant with overlapping chemistry, but not always equivalent traditional status.