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Cytotaxonomic Studies in the Gramineae Spartina, Andropogon and Panicum
George L. Church
American Journal of Botany
Vol. 27, No. 4 (Apr., 1940), pp. 263-271
Published by: Botanical Society of America, Inc.
Stable URL: http://www.jstor.org/stable/2436892
Page Count: 9
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The somatic chromosome complement is reported for the following members of the Gramineae: 9 species and 4 varieties of Spartina, 9 species and 8 varieties of Andropogon, and 3 varieties of Panicum. Intraspecific polyploidy is described in 3 species of Spartina. S. patens is tetraploid, the northern variety juncea is hexaploid and the southern variety juncea is octoploid. S. alterniflora of the strand is octoploid and the taller variety of tidal lagoons is decaploid. S. pectinata of the Atlantic coast is hexaploid and material from western United States is dodecaploid. The varieties studied of Andropogon virginicus of the Atlantic coastal plain, including A. glomeratus, are diploid. Similarly the varieties of A. scoparius, including A. littoralis, are tetraploid. Recent taxonomic treatments of these "species complexes" are in harmony with the cytological data. Tetraploid and hexaploid morphologically distinct forms of A. provincialis are reported. A large, ascending, decaploid form of A. saccharoides is described. An Atlantic coast tetraploid variety of Panicum virgatum is contrasted with western tetraploid and octoploid forms. Cytological data and citation of herbarium specimens concerned in the study are presented in a table.
American Journal of Botany © 1940 Botanical Society of America, Inc.