Of the foreign magnolias hardy in the North, two species and one group of hybrids are prominent: M. stellata (or M. Halleana) and M. Yulan or (M. conspicua), both white-flowered, the former very early and having 9-18 petals and the latter (which is a larger tree) having 6-9 petals; M. Soulangeana, a hybrid group including the forms known as Lennei, nigra, Norbertiana, speciosa, grandis. All these magnolias are deciduous and bloom before the leaves appear.
White mulberry, M. alba.
Russian mulberry, M. alba var. Tatarica. Teas’ weeping mulberry is a form of the Russian.
Pepperidge or gum-tree, Nyssa sylvatica* One of the oddest and most picturesque of our native trees; especially attractive in winter; foliage brilliant red in autumn; most suitable for low lands.
Iron-wood, hop hornbeam, Ostrya Virginica.* A good small tree, with hop-like fruits.
Sourwood, sorrel-tree, Oxydendrum arboreum.* Interesting small tree native from Pennsylvania in the high land south, and should be reliable where it grows wild.
Plane or buttonwood, Platanus occidentalis*†‡ Young or middle-aged trees are soft and pleasant in aspect, but they soon become thin and ragged below; unique in winter.
European plane-tree, P. orientalis.† Much used for street planting, but less picturesque than the American; several forms.
Aspen, Populus tremuloides,* Very valuable when well grown; too much neglected (Fig. 33). Most of the poplars are suitable for pleasure grounds, and as nurses for slower growing and more emphatic trees.