The Aizoaceae-a new approach

Bittrich, Volker; Hartmann, H. E. K.

doi:10.1111/j.1095-8339.1988.tb01581.x

Cited by 89 publications

(73 citation statements)

References 36 publications

(20 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Argyroderma is a genus of compact, perennial dwarf succulents that falls within the highly diverse arid-adapted subfamily, the Ruschioideae, in the family Aizoaceae (Bittrich and Hartmann 1988). Hartmann (1978) delimited 10 species in the genus Argyroderma, one of which has two subspecies (see Table 1 for names and Fig.…”

Section: The Plantsmentioning

confidence: 99%

“…The highly specialized hygrochastic fruit capsules of the Ruschioideae, which only release their seed when wet, limit seed dispersal in space and spread it through time by effectively coupling dispersal and germination cues (Hartmann 1988;Parolin 2001). Limited seed dispersal in the highly dissected landscapes of the succulent karoo renders genetic drift a likely mechanism of divergence between populations (Ihlenfeldt 1994).…”

mentioning

confidence: 99%

See 1 more Smart Citation

Evolutionary Radiation of "Stone Plants" in the Genus Argyroderma (Aizoaceae): Unraveling the Effects of Landscape, Habitat, and Flowering Time

2006

View full text Add to dashboard Cite

Abstract. Recent phylogenetic evidence suggests that the extraordinary diversity of the Cape Floristic Kingdom in South Africa may be the result of widespread evolutionary radiation. Our understanding of the role of adaptive versus neutral processes in these radiations remains largely speculative. In this study we investigated factors involved in the diversification of Argyroderma, a genus within the most spectacular of the Cape radiations, that of the Ruschioid subfamily of the Aizoaceae. We used amplified fragment length polymorphisms and a suite of morphological traits to elucidate patterns of differentiation within and between species of Argyroderma across the range of the genus. We then used a matrix correlation approach to assess the influence of landscape structure, edaphic gradients, and flowering phenology on phenotypic and neutral genetic divergence in the system. We found evidence for strong spatial genetic isolation at all taxonomic levels. In addition, genetic differentiation occurs along a temporal axis, between sympatric species with divergent flowering times. Morphological differentiation, which previous studies suggest is adaptive, occurs along a habitat axis, between populations occupying different edaphic microenvironments. Morphological differentiation is in turn significantly associated with flowering time shifts. Thus we propose that diversification within Argyroderma has occurred through a process of adaptive speciation in allopatry. Spatially isolated populations diverge phenotypically in response to divergent habitat selection, which in turn leads to the evolution of reproductive isolation through divergence of flowering phenologies, perhaps as a correlated response to morphological divergence. Evidence suggests that diversification of the group has proceeded in two phases: the first involving divergence of allopatric taxa on varied microhabitats within a novel habitat type (the quartz gravel plains), and the second involving range expansion of an early flowering phenotype on the most extreme edaphic habitat and subsequent incomplete differentiation of allopatric populations of the early flowering group. These results point to adaptive speciation in allopatry as a likely model for the spectacular diversification of the ice-plant family in the dissected landscapes of the southern African winter rainfall deserts.

show abstract

Section: The Plantsmentioning

confidence: 99%

mentioning

confidence: 99%

Evolutionary Radiation of "Stone Plants" in the Genus Argyroderma (Aizoaceae): Unraveling the Effects of Landscape, Habitat, and Flowering Time

2006

View full text Add to dashboard Cite

show abstract

“…ex Bittrich & H. H artm . ) is characterized by coilomorphic nectaries, and Bittrich & Hartmann (1988) mention them as a synapomorphic character for the subfamily. It is also worth noting that in Aptenioideae the number of carpels agrees with the number of perianth lobes as well as with the num ber of nectaries.…”

Section: Introductionmentioning

confidence: 99%

Nomenclature in Mesembryanthema (Aizoaceae): the generic names by Rappa and Camarrone

Hartmann¹,

Bittrich²

1990

Bothalia

View full text Add to dashboard Cite

A re-examination of the seven generic names used by Rappa and Camarrone reveals that three of them were validly published (Pentacoilanthus, Tetracoilanthus, Pteropentacoilanthus)\ the first one is lectotypified here. The other four names are invalidly published. Their synonymy is given nevertheless where possible. UITTREKSEL n Herondersoek van die sewe genusname wat Rappa en Camarrone gebruik het, toon dat drie van hulle geldig gepubliseer is (Pentacoilanthus, Tetracoilanthus, Pteropentacoilanthus)\ die eerste een word hier gelektotipifiseer. Die ander vier name is ongeldig gepubliseer. Hul sinonimie word nietemin aangegee waar moontlik.

show abstract

“…O gênero inclui 12 espécies, com registros nas regiões tropicais e subtropicais de todo o mundo, geralmente associadas a ambientes salinos (Bittrich & Hartmann 1989;Hartmann 1993;Bittrich 2002). No Brasil, está representado por apenas uma espécie (Zappi 2010 Ervas perenes, suculentas, prostradas, ramos quadrangulares em seção transversal, sulcados.…”

unclassified

Flora da Bahia: Aizoaceae

Lima¹,

Oliveira²,

Giulietti³

2012

Sitientibus sér. Ci. Biol.

View full text Add to dashboard Cite

2Royal Botanic Gardens, TW9 3AB, Richmond, United Kingdom.Resumo -É apresentado o levantamento florístico de Aizoaceae da Bahia, como contribuição ao conhecimento da flora do Estado. Foram reconhecidas as espécies nativas Sesuvium portulacastrum e Trianthema portulacastrum. É apresentada chave analítica, bem como descrições, ilustrações e comentários gerais sobre os táxons. Palavras-chave adicionais: Brasil, florística, Sesuvium, Trianthema.Abstract (Flora of Bahia: Aizoaceae) -This account of the Aizoaceae is a further contribution to the ongoing Flora of Bahia project. Two native species, Sesuvium portulacastrum and Trianthema portulacastum, are recognized for the state of Bahia, Brazil. A key, descriptions, illustrations and general notes on taxa are presented.

show abstract

The Aizoaceae-a new approach

Cited by 89 publications

References 36 publications

Evolutionary Radiation of "Stone Plants" in the Genus Argyroderma (Aizoaceae): Unraveling the Effects of Landscape, Habitat, and Flowering Time

Evolutionary Radiation of "Stone Plants" in the Genus Argyroderma (Aizoaceae): Unraveling the Effects of Landscape, Habitat, and Flowering Time

Nomenclature in Mesembryanthema (Aizoaceae): the generic names by Rappa and Camarrone

Flora da Bahia: Aizoaceae

Contact Info

Product

Resources

About