Chromosomes of villadia and altamiranoa (crassulaceae).

@article{Uhl1999ChromosomesOV,
  title={Chromosomes of villadia and altamiranoa (crassulaceae).},
  author={Charles H. Uhl and Reid Moran},
  journal={American journal of botany},
  year={1999},
  volume={86 3},
  pages={
          387-97
        }
}
Villadia, ranging from Texas to Peru with some 25 species, has a rather distinctive thyrsoid to spicate inflorescence, and we keep it as a genus separate from Sedum. Twenty species show every gametic chromosome number from 9 to 17 and also 20-22 and higher. Chromosome pairing in hybrids shows that the species differ by many translocations and that species with 21 or lower are effectively diploid. More specialized species tend to have fewer and larger chromosomes, suggesting that through time… 
LITTLE-KNOWN CRASSULACEAE OF CENTRAL PERU
TLDR
Six little-known Crassulaceae from central Peru are discussed, and Villadia virgata remains as the only valid species of Villadia in Peru, though there is evidence that other species may exist.
Linnaeus's folly – phylogeny, evolution and classification ofSedum(Crassulaceae) and Crassulaceae subfamily Sempervivoideae
TLDR
This study presents a broadly sampled and dated molecular phylogeny of Sempervivoideae including 80% of all infrageneric taxa described in Sedum as well as most other genera of the subfamily and believes that combination of all 14 genera currently recognized in tribe Sedeae into Sedum might be the most stable solution of the “Sedum problem”.
Sedum Mesoamericanum (Crassulaceae), a New Species from Mexico and Guatemala
Abstract: Sedum mesoamericanum is described as a new species, and illustrated based on collections from the Mexican states of Oaxaca and Chiapas, as well as Guatemala. It is distinguished by the
Estado actual de las Suculentas en el Perú
La suculencia, termino que se refiere a la apariencia engrosada de las partes vegetativas de las plantas, proviene etimologicamente del latin SUCCUS y se debe basicamente a la acumulacion de agua en
Biosystematics and conservation: a case study with two enigmatic and uncommon species of Crassula from New Zealand.
TLDR
The results suggest that these plants are a species complex that has evolved through interspecific hybridization and polyploidy and their high levels of chromosomal and DNA sequence variation present a problem for their conservation.
Illustrated Handbook of Succulent Plants: Crassulaceae
  • U. Eggli
  • Biology
    Illustrated Handbook of Succulent Plants
  • 2003

References

SHOWING 1-7 OF 7 REFERENCES
POLYPLOIDY, DYSPLOIDY, AND CHROMOSOME PAIRING IN ECHEVERIA (CRASSULACEAE) AND ITS HYBRIDS
The 140+ species of Echeveria have more than 50 gametic chromosome numbers, including every number from 12 through 34 and polyploids to n = ca. 260. With related genera, they comprise an immense
Chromosomes of Mexican Sedum II. Section Pachysedum
TLDR
Evidence from cytology presented here and also the evidence obtained from many artificially produced hybrids indicates that the mostly large and thick-leaved species with lateral inflorescences, or at least most of them, form a natural group, referred to here as sect.
Phylogenetic relationships in the Crassulaceae inferred from chloroplast DNA restriction-site variation.
TLDR
There is very strong support for a basal division of the Crassulaceae, which separates the monophyletic subfamily Crassuloideae from all other taxa, and four of the six traditionally recognized subfamilies are indicated to be polyphyletic.
Genetics of Flowering Plants
Genetics of flowering plants , Genetics of flowering plants , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی