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The cytogeography of aster pilosus compositae astereae 2. survey of the range with notes on aster depauperatus aster parviceps and aster porteri



The cytogeography of aster pilosus compositae astereae 2. survey of the range with notes on aster depauperatus aster parviceps and aster porteri



Rhodora 87(851): 367-380



Chromosome numbers of one or more individuals from 269 collections of A. pilosus were determined from throughout the range of the species. Two cytotypes were commonly encountered: 4x and 6x (x = 8). In A. p. var. pilosus, tetraploids and hexaploids were allopatric for the most part. Hexaploids occurred in the northwestern portion of the species' range. Intervarietal and infravarietal pentaploids encountered came from interface areas. All plants of A. pilosus var. pringlei (including A. p. var. demotus) were hexaploid and occurred in the northeastern portion of the range of the species. Only 3 plants were found to have supernumerary chromosomes. Two plants were putative heptaploids. In comparison, diploids have been found in the 3 related species A. porteri, A. depauperatus and A. parviceps. First reports: A. parviceps, 2n = 16; A. pilosus var. pilosus, 2n = 35 and 2n = 42; A. pilosus var. pringlei, 2n = 48 + 2.8 supernumeraries and 2n = 56; A. pilosus var. priceae, 2n = 32.

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