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Allegheny American Holly Arthur Hoyt asphaltum banana bark beautiful berries bloom Botany branches buds callused cambium Chestnut Hill collection color conifers County cover design creosote cultivation dense Department of Botany English Holly entrance of wood-destroying evergreens feet foliage forest frontispiece fruit fungi fungi and insects germicidal Gladwyne grafting green greenhouse ground cover growing growth Gustave Liebscher habit Halesia Harlan H Hemlock Henry horticultural forms hybrid injury interest leaves monticola Morris Arboretum Nursery ornamental trees paint Philadelphia Phlox Picea pink flowers Professor of Botany propagated region resin Rhododendron rock garden Rodney H season seed seedlings shade and ornamental shellac shown in Figure shrubs shrubs and plants Silverbell Skinner Snyder County soil species specimen stub surface Taxus Thuya tree-wound dressings true True's twig type of saw Ulmus University of Pennsylvania variety white flowers white pine white spruce winter wood-destroying fungi wound dressings York