An Illustrated Survey of Orchid Genera by Tom Sheehan

By Tom Sheehan

Greater than one hundred fifty orchid genera are defined, each one followed by way of a good Marion Sheehan representation that exhibits a consultant species; all reveal an analogous constructions in comparable perspectives in order that the reader can simply examine the differences between genera. In 1995, the authors got the yank Orchid Society's Gold Medal of feat.

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6). Therefore, to distinguish between the genera Laelia and Cattleya, count the pollinia. When these two genera are hybridized, the offspring have eight pollinia, but they, too, can be distinguished from their parents as the hybrid Laeliocattleya has four normal pollinia and four rudimentary pollinia. Seed. The seeds of orchids (Fig. 7) are very minute and do not contain the normal endosperm (stored carbohydrates needed for growth) found in seeds of corn, beans, and peas. Because an orchid seed has no endosperm, it lacks the capability of germinating in the wild without the aid of a fungus.

Figure 13. Encyclia flower dissected to show components. A: Lip. B: Petals. C: Sepals. D: Column and ovary. Just behind the anther cap on the under surface of the column is the rostellum (Fig. 4), which separates the pollinia from the stigmatic surface and prevents self-fertilization. The stigmatic surface lies just below the rostellum. Basically, the rostellum is a two-lobed structure of varying shape, covered with a very sticky substance, and connected to the ovary by a stylar canal (Fig. 4).

The average person in the Western Hemisphere might develop a mental picture of a purple Cattleya flower, whereas the average person in Southeast Asia might think of a Vanda flower. In the United States it is natural to think of Cattleya flowers because they have been widely used by the florist trade and in advertising for many years. Yet the genus Cattleya, with less than 65 species, makes up only a minute portion of the family Orchidaceae. " Orchidologists are aware of the multitude of orchids and their amazing array of flowers.

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