We have seen in previous chapters that Bamboos make beautiful clumps on lawns, and are appropriate for an approach to the waterside. They are full of grace, and make a splendid foil for more massive evergreens, such as Rhododendrons. Given sheltered positions and fairly fertile and moist soil, they grow into magnificent masses. They like a peaty soil, but are not very fastidious. Leaf mould may be added to stiff soil. They dislike strong cold winds, and exposed sites are therefore unsuitable. The Bamboos are made up of four botanical genera: Arandinaria, Bambusa, Phyllostachys, and Thamnocalamus. Nurserymen are liable to confuse these, and the pitfalls are indicated in the following selection of the best: Arundinaria. - Fortunei variegata, Hindsii, Japonica (Bambusa metake) nitida (a very graceful species with purple stems) and Simonii (syn. Bambusa Simoni); variegata is a form. Bambusa. - arundinacea,marmorea,Nagoshima, nana and palmata. Phyllostachys. - aurea, Castillonis, flexuosa, Henonis, nigra, mitis and viridi-glaucescens. Thamnocalamus. - falcata (syns. Arundinaria falcata and Bambusa gracilis) and Falconeri. The last is very hardy. Arundinaria Veitchii (syn. Bambusa Veitchii) is beautiful but far from hardy. Practically, all the Phyllostachys are commonly grown under the name Bambusa. The Bambusa tessellata sometimes met with in gardens is the same thing as Arundinaria Veitchii. If grown outside it might be put in a sheltered part of a large rock garden. Large Bamboos sometimes throw up flower-stems freely after growing (syn. dulcis), Darwinii (the best), Knightii, Fortuneii, stenophylla and Wallichiana (syn. Hookeri); of the deciduous, concinna, Thunbergii and vulgaris and its varieties. The newer kinds are described in Section A. There are several forms of stenophylla, such as corallina, diversifolia, erecta, gracilis, Irwinii (good for the rockery) and latifolia. Pruinosa is a rare Chinese species with glaucous leaves.