Chromosome Studies in Western North American Compositae

Abstract

Original chromosome observations including number for 68 taxa representing 47 genera are reported. Of these, 12 are first reports for species representing ten genera. In nine species multivalent associations (rings or chains) were noted; these were not always accompanied by low pollen stainability. Accessory chromosomes (centric fragments or univalents) were noted in two species.

More Chromosome Studies in Compositae

“…Format here is similar to that of earlier papers (Strother, 1972(Strother, , 1976; each entry in "Results and Discussion" consists ofname oftaxon (and synonym, if appropriate; first counts for species are marked *; for genera, **), indication of chromosome number and meiotic configuration(s), pollen stainability (if determined), collection information (Breedlove is abbreviated to B and his vouchers are in CAS; Strother is S and my vouchers and all others are in DC), references to other reports (if any, see following), and discussion (if appropriate). To provide access to original literature without having a long "Literature Cited" here, observations that confirm reports listed in indices edited by Fedorov (1969-for papers through ca.…”

“…Discovery of n = 13 in Gymnolaena suggests a closer taxonomic alliance with Dyssodia subg. Clomenocoma (x = 13) than with Tagetes (x = 12), cf Strother (1977)…”

“…Here I report on chromosomes of 138 species of Compositae, 93 of them from Chiapas, Mexico. MATERIALS AND METHODs-Chromosome number and meiotic behavior were observed in aceto-carmine squashes of microsporocytes and pollen stainabilities were determined from 200 grains after 48-72 hr in lactophenol-cotton blue (cf. Strother, 1972).…”

Determination of Chromosome Number of Kuwaiti Flora I.

“…This mitotic chromosome number was the same from the three different localities in Kuwait and which is consistent with the findings from the other countries indicating the high stability of the diploid number. Accordingly, the gametic number (Ghaffari 1987a, b); 2n=36 (Negodi 1935(Negodi , 19372n=44 (Meusel and Ohle 1966, Janaki and Sobti 1962, Forissier 1973, Queiros 1973, Van Loon 1974, Heyn et al 1974, Borgen 1975, Scrugli 1974, Gallego and Talvera 1983(2 References in IPCN 19922n=42 (Borgen 1974, Love andKjellquist 1974); 2n=14 (Humphries et al 1978); 2n=18 (Humphries et al 1978); n=22 (Strother 1972); n=23 (Rashid 1974 (Nazarova 1981); 2n=54 (Stebbins et al 1953);2n=40 (Podlech and Bader 1974). Comment: The counts of chromosomes of sporophytic are the hexaploid 54 and the tetraploid 36 and gametic number is 18 and all are first to be reported from Kuwaiti flora.…”

Chromosome studies: Latin American Compositae

“…Documented records ofchromosome numbers in natural populations continue, therefore, to be invaluable in the postulating of phylogenies and in the constructing of taxonomies (cf. Strother, 1972).…”