Tropical Africa and Madagascar,
requiring to be grown in the warm house in moist and shady conditions.
The flowers are generally of rose colour.

~Cypripedium.~--This is one of the largest, most useful, and most prolific
genera, which, although commonly known in gardens as Cypripedium, may be
divided into several distinct classes. Most of those generally known in
gardens as Cypripediums have been termed Paphiopedilum, including _C.
barbatum_, and _C. Rothschildianum_, and the green-leafed class, more
commonly known in gardens as Selenipedium, are now termed
Phragmopedilum. The name Cypripedium, however, has so firm a hold on
cultivators that it is convenient to retain it in gardening handbooks.

The Cypripediums have very numerous hybrids, and their numbers increase
annually. An enumeration is therefore impossible within the scope of
this work. All require to be treated as terrestrial Orchids, a
proportion of fibrous loam (see the chapter on potting terrestrial
Orchids) being added in proportion to the strength of the subject, the
largest proportion being given to the strongest growers. The
Selenipedium, or green-leafed section, should be potted in fibrous loam,
with a sprinkling of leaves and Sphagnum-moss. _C. insigne_, _C.
Spicerianum_, _C. Charlesworthii_, and others of the class, also hybrids
of them, may be grown in the cool house. _C. Rothschildianum_, _C.
Stonei_, and the whole of that section require the highest temperature,
but all may be grown successfully in an intermediate house. _C. insigne
Sanderae_ is illustrated in Plate I.

~Cyrtopodium.~--A strong-growing genus needing to be grown in the
intermediate house. The plants should be potted as terrestrial Orchids.
_C. punctatum_ is the showiest and most easily grown species.

~Dendrobium.~--One of the largest and most decorative genera of epiphytal
Orchids, comprising several hundred species and a large number of
hybrids. Primarily the genus may be divided into two classes--the
evergreen; and the deciduous, which lose their leaves after the
completion of the growths, and should have a protracted dry resting
season. The evergreen species have a shorter and less rigorous resting
season accorded them. The deciduous class is exemplified by _D. nobile_,
_D. Wardianum_, _D. crassinode_, and the plants associated with them,
and their hybrids; and the evergreen species by _D. densiflorum_, _D.
Farmeri_, and _D. chrysotoxum_. _D. Wardianum_, with 264 flowers, is