It contains geographically arranged sections of plants from Asia, North America, etc ., including the unusual " Quercus phellos " as well as " Corydalis nobilis ", " Hamamelis ", rhododendrons, magnolias, and so forth; a systematic section; an alpine garden collecting a variety of European high mountain plants, including gentian ( " Gentiana " ), species of saxifrage ( " Saxifraga " ), " Dianthus caryophyllus ", numerous cruciferous plants and primroses; and a garden that contains poisonous, curative, and medicinal plants.