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Z. maxillare crossed with Z. Mackayi demands five years to bloom, but vice versâ nine years. There is a case somewhat similar, however, among the Cypripeds. C. Schlimii crossed with C. longifolium flowers in four years, but vice versâ in six.
Cypripeds have not the power of fertilizing themselves, except a single species, Cyp. Schlimii, which accordingly, as we may say is most difficult to import and establish; moreover, it flowers so freely that the seedlings are always weak. In all species the sexual apparatus is so constructed that it cannot be impregnated by accident, and few insects can perform the office. Dr.
Schlimii × Cyp. longiflorum; curious as the single instance yet noted in which seedlings turn out identical, whichever parent furnish the pollen-masses. In every other case they vary when the functions of the parents are exchanged. For a long time after 1853, when serious work begun, Messrs. Veitch had a monopoly of the business.
I have been speaking hitherto of Colombian Odontoglossums, which are reckoned among the hardiest of their class. Along with them, in the same temperature, grow the cool Masdevallias, which probably are the most difficult of all to transport. There was once a grand consignment of Masdevallia Schlimii, which Mr. Roezl despatched on his own account.
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