Chromosome numbers in Compositae. XVIII.

@article{Carr1999ChromosomeNI,
  title={Chromosome numbers in Compositae. XVIII.},
  author={Gerald D. Carr and Robert M. King and ANNE M. Powell and Harold Ernest Robinson},
  journal={American journal of botany},
  year={1999},
  volume={86 7},
  pages={
          1003-13
        }
}
Chromosome numbers and other cytogenetic data were determined from microsporocytes in 316 collections including 13 tribes of Compositae, mostly from Africa, Australia, Mexico, Central America, and South America. First reports are provided for 66 species and the genera Cassinia (2n ≈ 14(II)), Feldstonia (2n = 11(II)), Gochnatia (2n ≈ 23(II)), and Pseudoconyza (n = 10). In addition, new chromosome numbers are established at the generic level in Acourtia, Calea, Craspedia, Gnaphalium, Helipterum… 
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First counts for 28 species, including the first count for Psacaliopsis, may prove to be especially interesting in relation to phyletic and taxonomic alignments of the taxa.
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Chromosome information about the small South American genus Isostigma (Heliantheae, Asteraceae) is reported for the first time and substantial differences in karyotype formula, chromosome size and asymmetry level are revealed.
CHROMOSOME NUMBERS IN SOME TRIPLEUROSPERMUM (ASTERACEAE) SPECIES FROM IRAN
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The aim of the present study is to provide karyological data of Tripleurospermum that might increase the knowledge on systematic and evolutionary relationships within the genus.
Polyploidy and new chromosome counts in Pseudognaphalium Kirp. (Compositae: Gnaphalieae)
TLDR
This study provides a total of 20 chromosome counts, nine of which are the first report for a species, and the rest are confirmation of previous reports, suggesting that polyploidy played a key role in the colonization of the American continent by the genus Pseudognaphalium.
New chromosome counts in some species of Asteraceae from Iran
TLDR
Seven chromosome counts of six species from the family Asteraceae are reported, with most of the studied taxa having the basic number x=9, but Senecio glaucus has x=10, with ploidy levels ranging from 2x to 8x.
New Chromosome Counts in the Tribe Anthemideae (Astraceae) from Iran
TLDR
Seventeen chromosome counts of 15 taxa (15 species) in the tribe Anthemideae of the family Astraceae are reported, with ploidy levels ranging from 2× to 10×.
Variation of chromosome numbers in Tanacetum parthenium Schultz Bip. (Asteraceae) in Iran
TLDR
The results indicated that intraspecific polyploidy was confirmed as the most significant evolutionary trend in chromosome number within this species.
CHROMOSOME NUMBERS AND KARYOTYPES IN ASTERACEAE 1
TLDR
The base chromosome numbers of Calyceraceae and Asteraceae are discussed in published records and the original counts, and new chromosome numbers are established at the generic level in the genera Barnadesia Mutis, Eremanthus Less, and Trichocline Cass.
CHROMOSOME NUMBERS AND KARYOTYPES IN ASTERACEAE1
Abstract Chromosome numbers were determined from microsporocytes (meiotic counts) and root-tip cells (mitotic counts) in 201 collections of 51 genera and 119 specific and infraspecific taxa belonging…
Cytogenetic variations in eight species of Saussurea DC. (Asteraceae, Cardueae) from Northwest Himalaya
TLDR
The meiotic studies on different populations of Saussurea reveal a substantial amount of meiotic abnormalities in the form of chromosome stickiness, un-oriented bivalents, cytomixis, laggards, etc. leading to the meiocytes with less (aneuploidy) or more (polyploidsy) chromosome numbers.
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