TAXONOMY 
285 
Official drug Part used Botanical name Habitat 
Hydrangea N.F. Rhizome and roots Hydrangea United States 
arborescens 
Hamamelidacece or Wilchhazel Family . — Shrubs or small or large 
trees. Leaves, simple, alternate and pinnately veined; stipules 
deciduous to caducous, paired and slightly fused at the bases of 
petioles. Flowers frequently yellow to yellowish-white, in axillary 
clusters or heads or spikes, hermaphrodite or monoecious; sepals 
and petals five to four rarely indefinite, superior (petals absent in 
F other gilla ) ; stamens twice as many as the petals but the outer row 
alone fertile, the inner row being more or less barren and scale-like; 
