Phylogeny and Classification of the Orchid Family by Robert L. Dressler, Kerry Dressler

By Robert L. Dressler, Kerry Dressler

Recipient of the 1994 Henry Allan Gleason Award of the recent York Botanical backyard, this significant publication delimits a number of significant traditional teams in the orchids, suggesting components that desire additional study by way of botanists.Published at $49.95 Our final copies to be had at $24.98

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Extra resources for Phylogeny and Classification of the Orchid Family

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At least four distinct processes are involved in producing the pattern we call phylogeny. 1. Separation. The division of one population or lineage into two is the usual first step. Geographic isolation is probably the major factor in separating populations, but not necessarily the only type of separation. 2. Speciation. Speciation and separation or isolation may occur simultaneously in special cases, as in allopolyploidy, the doubling of chromosome number in a hybrid. In most cases, though, geographic isolation is thought to precede speciation.

When there is a prominent column foot, the flower usually has a spurlike "chin" or mentum when seen from the side (E). The column foot is especially well developed in the Scaphyglottis complex and in the Dendrobiinae, where the column foot and the lip together sometimes form a complex structure. Staminodia In the apostasioids and lady's slippers, the lateral stamens are both fertile. In the monandrous orchids, only the median stamen is normally fertile, and the lateral stamens are often represented as sterile stamens (staminodia), or column wings.

2-11HJ). In the advanced Epidendroideae, the anther may be secondarily erect, as in Stelis, Malaxis, Notylia, Rodriguezia, and the Podochilinae. In most orchids of the vandoid grade (Cymbidieae, Maxillarieae, Vandeae), the bending of the anther during development is less obvious. In 1981, I saw this as a fundamental difference between the epidendroid and vandoid grades and treated them as distinct subfamilies. Now we have more information on column development, and it is clear that Hirmer (1920) was correct in interpreting the vandoid anther as being bent like that of the epidendroid anther but bending earlier in its development.

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