This section is from the book "Commercial Gardening Vol2", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
The development of open-air gardening has brought about a trade in many kinds of hardy terrestrial orchids, most of which are grown for sale in pots, and are used for the decoration of nooks in the rock garden or by the boggy banks of pools of water, being mostly grown in leaf mould or peat and sphagnum moss. The following kinds are in commerce: Aplectrum hyemale, a one-leaved orchid with richpurple flowers, having a white lip tinged with crimson. Bletia hyacinthina, broad plaited leaves and brilliant rose-purple flowers, with a white variety. Calopogon pulchellus, leaves grassy, flowers bright purple with yellow and white hairs. Calypso borealis, bulbous, with heartshaped leaves and rose-purple flowers with a white lip, having a yellow crest and deep brown blotches. Cypripediums or Lady Slipper orchids, including acaule, arietinum, Calceolus, californicum, candidum, guttatum, japonicum, macranthum, montanum, parviflorum, pubescens, and spectabile. Epi-pactis gigantea, 3 ft., with loose racemes of purple and brown flowers; latifolia, white and purple; palustris, white, tinged with crimson, drooping; rubiginosa, reddish purple. Goodyera Menziesi, leaves mottled, flowers white, and pubescens, with netted leaves and white flowers. Habenaria ciliaris, dilatata, Hookeri, obtusa, and psycoides, all interesting orchids with fringed lips. To these may be added the various species of Ophrys, including the Bee Orchis (0. apifera), the Spider Orchis (0. aranifera), the Bumble Bee Orchis (0. bombilifera), and the beautiful spotted orchids Orchis maculata, 0. pyramidalis, 0. latifolia, 0. laxi-flora, etc. (see also p. 185).