An Illustrated Survey of Orchid Genera by Tom Sheehan

By Tom Sheehan

Greater than one hundred fifty orchid genera are defined, every one observed through an exceptional Marion Sheehan representation that exhibits a consultant species; all exhibit an identical buildings in comparable perspectives in order that the reader can simply evaluate the diversities between genera. In 1995, the authors bought the yank Orchid Society's Gold Medal of accomplishment.

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E: Orchis. F: Ophrys. G: Ponthieva. H: Habenaria. I: Calopogon. J: Arethusa. K: Sobralia. L: Thunia. M: Arundina. N: Liparis. O: Bonatea. P: Brachycorythis. 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.

A typical orchid flower (Cattleya) showing face view (left) and side view (right). Page 20 Figure 9. Cattleya buds emerging from the sheath. The visible floral parts are the sepals. each of the lateral petals as well. This then would account for the missing anthers. Occasionally, a hard yellow structure that looks like anther tissue appears on the margins or other parts of the petals and the lips. This occurrence lends support to this theory. The remainder of the inner whorl of floral segments in the orchid flower is composed of two petals (Fig.

The caudicle or stipe may be a simple stalk or have an elaborate foot covered with a very viscid substance. In some cases, closely allied genera may be separated by their pollinia. Cattleya, for example, has four pollinia whereas Laelia has eight (Fig. 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.

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