henrici which was initially thought to be an astilbe was collected by Prince Henri d'Orleans in 1895 but this has recently been reduced to a variety of R. aesculifolia.
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nepalensis was not identified until in 1966 in the UK from a collection by Peter Schilling who made a second collection of seeds of this species .
Arboretum Trompenburg holds national plant collections of conifers, Quercus, Fagus, Rhododendron, Ligustrum, Rodgersia and Hosta.