Revision of Tristerix (Loranthaceae)

Kuijt, Job

doi:10.2307/25027693

Cited by 103 publications

(66 citation statements)

References 12 publications

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“…To complement and verify published data (Feuer & Kuijt 1978, 1980; Kuijt 1988; Liu & Qiu 1993; Han et al 2004; Roldán & Kuijt 2005; Caires 2012; Caires et al 2012, 2014; see File S4), we studied 35 genera of Loranthaceae, including 15 studied for the first time to our knowledge (Figure 2; File S5). The micrographs in Liu and Qiu (1993) and Han et al (2004) are of mediocre quality, typically out of focus, and do not allow identifying ornamental or structural details.…”

Section: Resultsmentioning

confidence: 74%

Evolution of pollen morphology in Loranthaceae

Grímsson

Grimm

Zetter

2017

Grana

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Earlier studies indicate a strong correlation of pollen morphology and ultrastructure with taxonomy in Loranthaceae. Using high-resolution light microscopy and scanning electron microscopy imaging of the same pollen grains, we document pollen types of 35 genera including 15 studied for the first time. Using a molecular phylogenetic framework based on currently available sequence data with good genus-coverage, we reconstruct trends in the evolution of Loranthaceae pollen and pinpoint traits of high diagnostic value, partly confirming earlier intuitive hypotheses based on morphological observations. We find that pollen morphology in Loranthaceae is strongly linked to phylogenetic relationships. Some pollen types are diagnostic for discrete genera or evolutionary lineages, opening the avenue to recruit dispersed fossil pollen as age constraints for dated phylogenies and as independent data for testing biogeographic scenarios; so far based exclusively on modern-day data. Correspondences and discrepancies between palynological and molecular data and current taxonomic/systematic concepts are identified and suggestions made for future palynological and molecular investigations of Loranthaceae.

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Section: Resultsmentioning

confidence: 74%

Evolution of pollen morphology in Loranthaceae

Grímsson

Grimm

Zetter

2017

Grana

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“…The presence of two lateral bracteoles in addition to the subtending bract in flowers of T. aphyllus Tiegh. ex Barlow & Wiens and T. corymbosus (L.) Kuijt (Reiche 1904;Kuijt 1988) supports the interpretation that each flower along the terminal raceme in T. longebracteatus and T. secundus corresponds to a dichasium reduced to the terminal flower (Suaza-Gaviria & al. 2017).…”

Section: Inflorescence Development and Structurementioning

confidence: 61%

“…1997). Thus, the inflorescence and floral traits related to pollination remain to be investigated in neotropical taxa, including Tristerix Mart., a genus that comprises 12 species confined to high elevations in the Andes from Colombia to Chile (Barlow & Wiens 1973;Kuijt 1988Kuijt , 2015.…”

Section: Introductionmentioning

confidence: 99%

Inflorescence and floral traits of the Colombian species of <em>Tristerix (Loranthaceae)</em> related to hummingbird pollination

González

Pabón‐Mora

2017

Anal. Jard. Bot. Madr.

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Abstract. Floral diversification in Loranthaceae reaches its highest peak in the Andes. The flowers of the exclusively Andean genus Tristerix exhibit tubular and vividly coloured flowers pollinated by hummingbirds. We studied inflorescence and flower morphoanatomy of the two Colombian species, T. longebracteatus and the highly endangered T. secundus. Both species have terminal racemes with up to 26 ebracteolate flowers, of which the proximal one opens and sets fruits first. The slightly irregular calyx initiation is followed by the simultaneous initiation of petals and the successive initiation of stamens. Anthesis is fenestrate, explosive, and triggered by the tension of the style against the abaxial petals, a mode so far not reported in Loranthaceae. Anthetic petals spread symmetrically in T. longebracteatus and asymmetrically in T. secundus. Nectar is produced by a supraovarial disk and by the petal mesophyll. Floral lifespan lasts up to 20 days. The hummingbirds Eriocnemis vestita and Pterophanes cyanopterus are the likely pollinators of T. secundus. Morphological traits are inconclusive to support one of the two competing sister group relationships that involve Tristerix, as the lack of cataphylls in renewal shoots links Ligaria and Tristerix, whereas the terminal inflorescences support its relationship with Desmaria and Tupeia.Resumen. La diversificación floral en Loranthaceae alcanza su máxima expresión en los Andes. Las flores del género Tristerix, restringido exclusivamente a dicha cordillera, exhiben flores tubulares y de color llamativo que son polinizadas por colibríes. Se ha realizado un estudio de la morfoanatomía de inflorescencias y flores en las dos especies colombianas del género, T. longebracteatus y T. secundus, esta última muy amenazada. Las dos especies tienen racimos terminales hasta con 26 flores ebracteoladas, de las cuales la proximal se abre y forma el fruto antes que las demás. La iniciación del cáliz, levemente irregular, es seguida por la iniciación simultánea de los pétalos y la iniciación sucesiva de los estambres. La antesis es fenestrada, explosiva y se activa por la tensión del estilo contra la comisura de los dos pétalos abaxiales, un modo de antesis hasta ahora no descubierta en Loranthaceae. Los pétalos en antesis se expanden simétricamente en T. longebracteatus y asimétricamente en T. secundus. El néctar se produce en un disco supraovárico y el mesófilo de los pétalos. El periodo entre la antesis y la iniciación del fruto dura hasta 20 días. Las especies de colibrí Eriocnemis vestita y Pterophanes cyanopterus son los visitantes y probables polinizadores de T. secundus. Los rasgos morfológicos de Tristerix no aportan información concluyente para apoyar una de las dos hipótesis relacionadas con los posibles grupos hermanos del género, ya que la ausencia de catafilos en los brotes de renuevo asocian Ligaria y Tristerix, en tanto que las inflorescencias terminales apoyan una relación cercana a Desmaria y Tupeia. Title in Spanish: Caracteres de la inflorescencia y las flores de ...

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“…flowers show no evidence of associated prophylls. In other genera, however, each flower is accompanied by a distinctive pair of prophylls; such is the case in Maracanthus (Kuijt 1976a), Oryctanthus (Kuijt 1976b), Oryctina (Kuijt (1981a), Dendropemon (Kuijt 2011a), two species of Tristerix (Kuijt 1988b) and Panamanthus (Kuijt 1991). In all these cases, a regular calyculus is formed without any developmental involvement by prophylls.…”

Section: Monadsmentioning

confidence: 99%

“…Quite aside from the fact that it is based on only two species, it must be remembered that di morphism in the corolla and androecium is by no means universal in the Loranthaceae; in fact, it appears to be almost entirely restricted to the New World. Even there, there are species and genera that have isomorphic petals and stamens, or nearly so, as in some species of Psittacanthus (Kuijt 2009), as well as the genus Tristerix (Kuijt 1988b) and the monotypic genus Pusillanthus (Kuijt 2008). It is also difficult to appreciate how the biseriate corolla concept can apply to the numerous taxa, in both hemispheres, that have 5-or 7-merous corollas.…”

Section: Biseriate Corolla Conceptmentioning

confidence: 99%

Prophyll, calyculus, and perianth in <I>Santalales</I>

Kuijt¹

2013

Blum - J Plant Tax and Plant Geog

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The concepts of prophyll and calyculus in Santalales are reviewed, and are found to be of variable taxonomic importance in different families. The calyculus in Loranthaceae has been generally interpreted as a reduced calyx, a concept recently challenged by Wanntorp & Ronse De Craene (2009), who concluded that it represents a fusion of prophylls. This view, as well as the accompanying biseriate corolla notion, is rejected. In Loranthaceae, prophylls associated with flowers have sometimes provided significant taxonomic features, while in Viscaceae this is true mostly in the vegetative portions of plants, especially in Arceuthobium, Dendrophthora and Phoradendron.

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Revision of Tristerix (Loranthaceae)

Cited by 103 publications

References 12 publications

Evolution of pollen morphology in Loranthaceae

Evolution of pollen morphology in Loranthaceae

Inflorescence and floral traits of the Colombian species of <em>Tristerix (Loranthaceae)</em> related to hummingbird pollination

Prophyll, calyculus, and perianth in <I>Santalales</I>

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