Transfers to Epidendrum L. from Oerstedella Rchb. f
| Autor: | Eric Hágsater |
|---|---|
| Jazyk: | Spanish; Castilian |
| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Lankesteriana: International Journal on Orchidology; 2005: Lankesteriana: Volumen 5, Número 1 Portal de Revistas UCR Universidad de Costa Rica instacron:UCR |
| ISSN: | 2215-2067 1409-3871 |
| Popis: | A cladistic analysis of Epidendrum, its segregates, and of the entire subtribe Laeliinae, based on DNA nucleotidic sequences, has shown that Oerstedella is embedded in Epidendrum. Five new combinations are made and 2 new names are established in order to transfer all Oerstedella species to Epidendrum. RESUMEN. Un analisis cladistico de Epidendrum y taxa afines, basado en estudios de secuencias de ADN, ha revelado que Oerstedella es un grupo de Epidendrum. Este genero tiene tres clados principales: uno mexicano, uno andino y uno ampliamente distribuido. Oerstedella pertenece a este ultimo clado, que es basal en un subclado mayormente centroamericano. Aqui se realizan 5 combinaciones nuevas y se establecen 2 nombres nuevos, para poder transferir todas las especies de Oerstedella a Epidendrum. The genus Oerstedella was established by H.G. Reichenbach (1852) for the Central American Epidendrum centropetalum Rchb.f. Hagsater (May 1981) and Hamer & Garay (Hamer, October 1981) independently recognized the genus Oerstedella as different from Epidendrum. Oerstedella is distinguished from Epidendrum, with which it shares the fusion of the lip claw to the apex of the column and the presence of a cuniculus-type of nectary, because it has a rostellum perpendicular to the longitudinal axis of the column, which after the removal of the pollinarium is widely sinuate, instead of parallel and slit. Additionally, the lateral lobes of the stigma are not protruding and it lacks a semiliquid viscidium. The presence of a very long clinandrium of the column (in some species) and of warty sheaths clothing the stems (in most species) are also characteristic, although neither one is a synapomorphy of the group. Long clinandria are found in the Physinga group and the Epidendrum albertii Schltr. group of Epidendrum, and warty sheaths may be found, if less conspicuous, in E. propinquum A. Rich. & Galeotti. A cladistic analysis of Epidendrum, its segregates (Hagsater & Soto, in press, Hagsater et al., in prep), and of the entire subtribe Laeliinae (van den Berg et al. 2000, van den Berg 2000), based on nucleotidic sequences of different genomic regions (Internal Transcribed Spacers of nuclear ribosomal DNA, ITS, and the plastid matK and trnL regions) has shown that Oerstedella is embedded in Epidendrum. Epidendrum has three main lineages, a Mexican, an Andean, and a widely distributed clade. Oerstedella belongs to the widely distributed clade and it is basal to a mostly Central American subclade with species bearing distichous inflorescences, including the segregates Auliza (based on Epidendrum ciliare L.), Coilostylis (based on C. emarginata Raf. = E. ciliare L.), Didothion (based on E. clavatum Lindl. = E. purpurascens H.Focke), Epidanthus (based on Epidendrum paranthicus Rchb.f.), Neowilliamsia (based on N. epidendroides Garay), the E. ramosum Jacq. group, and the Spathiger group (based on E. rigidum Jacq.). Instead of recognizing the twenty-eight segregated genera and proposing some forty new ones in order to make the already existing segregates monophyletic groups, we have decided to recognize only one large, single genus Epidendrum, which is easily set apart in the Laeliinae by the fusion of the column with the lip (though some odd species may have them partially or totally free). Our circumscription of Epidendrum is basically that of Dressler (1984) and Hagsater (1985), except that Oerstedella, Epidanthus, and Neowilliamsia must be included in it. These three taxa have relatively few species compared with the size of Epidendrum (more than 1500 species). It thus becomes necessary to transfer those Oerstedella taxa for which there are no previous combinations in Epidendrum: Epidendrum cancanae (P.Ortiz) Hagsater, comb. nova Basionym: Oerstedella cancanae P.Ortiz, Orqui |
| Databáze: | OpenAIRE |
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