Download An Illustrated Survey of Orchid Genera by Tom Sheehan PDF

By Tom Sheehan

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

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Extra resources for An Illustrated Survey of Orchid Genera

Example text

It may have had three or six anthers. If this hypothesis is true, then the evolution of the orchid flower is relatively easy to imagine. Since most orchids including Cattleya contain only one anther, it could be assumed that two to five anthers disappeared in the evolutionary process. These anthers probably became petaloid and possibly two or more fused with one of the petals to form the lip. Since the petals of many flowers are larger than the sepals, there is also the possibility that one anther may have fused with Figure 8.

Each pollinium or pair of pollinia is attached to a stalk (caudicle or stipe), which comes in Page 17 Figure 4. Reproductive structures. A: Cattleya. Aa: Column and ovary, side view. Ab: Column, ventral view. Ac: Column, vertical section. Ad: Column, end view. Ae: Anther cap with pollinia in place. B: Paphiopedilum column, vertical section. contact with pollinators as they leave the flower. Pollinia and their stalks vary from genus to genus (Fig. 5). Most pollinia are yellowish in color and ovoid in shape.

Q: Eulophia. R: Calanthe. S: Vanda. T: Cymbidium. U: Thelymitra. V: Pterostylis. W: Disa. Page 15 Figure 2. Flower variation in epiphytic orchids drawn at varying scales to show details. A: Miltonia. B: Cattleya. C: Trigonidium. D: Encyclia. E: Brassavola. F: Maxillaria. G: Coryanthes. H: Mormodes. I: Oncidium. J: Pleurothallis. K: Eurychone. L: Angraecum. M: Aerides. N: Paraphalaenopsis. O: Dendrobium. P: Tridactyle. Q: Vandopsis. R: Phalaenopsis. S: Bulbophyllum. T: Sarchochilus. Page 16 teristics is an orchid, and since seeds are not always present, orchidists must rely heavily on the first four characteristics when checking an unknown plant to determine if it is an orchid.

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