By Tom Sheehan
Greater than one hundred fifty orchid genera are defined, each one observed via a good Marion Sheehan representation that indicates a consultant species; all exhibit a similar buildings in related perspectives in order that the reader can simply examine the diversities between genera. In 1995, the authors got the yank Orchid Society's Gold Medal of feat.
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Extra resources for An Illustrated Survey of Orchid Genera
Often called ''little beak,'' the rostellum is a sterile extension of the apex of the stigma. It lies between the stigmatic surface and the pollinia on the underside of the column (Fig. 4). This unique glandular structure serves two important purposes. First, it serves as a tissue dam to separate the pollen grains from the stigmatic surface. In this role it assures that self-pollination does not occur and that the flowers are cross-pollinated. ) The rostellum's second role is to insure that insects or other pollinators visiting the flower take pollinia with them when they leave.
3 inch (34 mm) to over 12 inches (30 cm) in diameter. The more than 800 genera of orchids (some taxonomists say the figure is closer to 900) are grouped approximately into 74 subtribes, 20 tribes, and 5 subfamilies. How then, with this great diversity of vegetative forms and flower differentials, can the 25,000 known species be tied into one family, the Orchidaceae? What do these plants have in common? Members of the Orchidaceae are related by floral characteristics. Becoming familiar with these characteristics makes identifying orchids easier.
4). This unique glandular structure serves two important purposes. First, it serves as a tissue dam to separate the pollen grains from the stigmatic surface. In this role it assures that self-pollination does not occur and that the flowers are cross-pollinated. ) The rostellum's second role is to insure that insects or other pollinators visiting the flower take pollinia with them when they leave. As a gland, the rostellum is capable of dispensing a very viscid substance. When an insect (called a pollinator) enters a flower and forces its way beneath the column, the upper portion of its body comes in contact with the rostellum.
An Illustrated Survey of Orchid Genera by Tom Sheehan