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(American Journal of Botany. 1999;86:1003-1013.)
© 1999 Botanical Society of America, Inc.

Chromosome numbers in Compositae. XVIII.1

Gerald D. Carr 2, 5, Robert M. King 3 , A. Michael Powell 4 and Harold Robinson 3

2Department of Botany, University of Hawaii at Manoa, Honolulu, Hawaii 96822; 3Department of Botany, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560; and 4Department of Biology, Sul Ross State University, Alpine, Texas 79832

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 {approx} 14II), Feldstonia (2n = 11II), Gochnatia (2n {approx} 23II), and Pseudoconyza (n = 10). In addition, new chromosome numbers are established at the generic level in Acourtia, Calea, Craspedia, Gnaphalium, Helipterum, Liabum, Leucheria, Smallanthus, Trixis, and Viguiera and at the specific level in 13 additional species.

Key Words: Asteraceae • chromosome numbers • Compositae • cytotaxonomy • cytogenetics




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