Botanical orchid is a loose term to denote mainly small flowered tropical orchids belonging to several genera (not necessarily related to each other) that don't fit into the "Florist" orchid category. A few of these genera contain enormous numbers of species. Some, such as Pleurothallis and Bulbophyllum, contain approximately 1700 and 2000 species, respectively, and are often extremely vegetatively diverse. The primary use of the term is among orchid hobbyists wishing to describe unusual species they grow, though it is also used to distinguish naturally occurring orchid species from horticulturally created hybrids.
The genus indication orchid is not mentioned in the cases of orchidhybrids and cultivars.
orchid leaves that are exhibitied in nature to a lot of sunshine have acquired a natural protection in the form of reddish pigments such as anthocyanine that diminishes the harmful influence of ultraviolet radiation.
Therefore, in the spring, orchids have to adapt gradually to the increasing sunlight intensity.
The orchid family graphically demonstrates that cross-fertilization is necessary to create new genetic material, which by means of natural selection will evolve and adapt to an available environment.' The book describes the relationship between sexual structures of orchids and the insects which fertilise them and attributes their evolution to natural selection.
These are the botanical results of a biological exploration of Lower California carried out in 1905 and 1906 by E. Nelson and Goldman, of the Bureau of Biological Survey, US Department of Agriculture, giving lists of plants, notes on distribution, descriptions, ecological and economic data, and technical descriptions of three new species of oak.
Vancouver, The Botanical Garden University of British Columbia, 1979, First edition, oblong 4to [20.5 x 25 cm]; xv, 116 pp, numerous illus in color and fl and white from paintings, bibliog, orig pictorial heavy paper wraps, pictorial endpapers, minor rubbing, interior is clean and near fine, unmarked.
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