期刊
AMERICAN JOURNAL OF BOTANY
卷 96, 期 5, 页码 1020-1040出版社
WILEY
DOI: 10.3732/ajb.0800219
关键词
Cranichideae; Cranichidinae; molecular phylogenetics; Orchidaceae; Prescottiinae; Spiranthinae; terrestrial orchids
资金
- Fundacion para la Ciencia y Tecnologia del Ecuador (FUNDACYT)
- New York Botanical Garden
- American Orchid Society
- Furniss Foundation
- Garden Club of America
- Lewis B. and Dorothy Cullman Foundation
- Explorers' Club
- International Association for Plant Taxonomy
- American Society of Plant Taxonomists
- Botanical Society of America
- O'Higgins Foundation
- City University of New York
The Andes are a cradle of orchid evolution, but most phylogenetic studies of Orchidaceae in this biodiversity hotspot have dealt with epiphytic epidendroid lineages. Here we present a study on neotropical, terrestrial, orchidoid taxa of Prescottiinae s.1. (8 genera, similar to 100 species), which are adapted to some of the highest elevation habitats oil earth that support orchids. They are currently included Within an expanded concept of Cranichidinae in the tribe Cranichideae, but DNA sequence data show that neither Prescottiinae s.l. nor Cranichidinae s.s. are monophyletic. Prescottinae s.l. consist Of two strongly Supported lineages: the Altensteinia and Prescottia clades. which have closer affinities to Spiranthinae than to Cranichidinae. The Prescottia clade comprises two well-supported subclades. One including most sampled species of Prescottia and a second one with Pseudocranichis thysanochila sister to Prescottia tubulosa. As a group, they are sister to Spiranthinae. Sister to this pair is the Altensteinia clade comprised of six genera, whose intergeneric relationships are well resolved. Finally, Cranichidinae s.s. is Sister to all three of these clades. Morphological and ecological features distinguishing the major groups are discussed, as are potential synapomorphies to define them. The reconstructed phylogeny indicates that the classification of Cranichideae needs to he reexamined.
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