Cytotaxonomic Notes on Eleven Species of Cirsium Native to Mexico

Data on chromosome numbers in eleven species and three forms of Cirsium are presented. The species treated are C. nivale (H.B.K.) Schultz Bip., C. jorullense (H.B.K.) Spreng., C. durangense (Greenman) Ownbey, C. ochrocentrum Gray, C. undulatum (Nutt.) Spreng., C. velatum (Wats.) Petrak, C. Mexicanum...

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Bibliographic Details
Published in:Brittonia 1968-10, Vol.20 (4), p.336-342
Main Author: Ownbey, Gerald B.
Format: Article
Language:English
Subjects:
Alliances
Biological taxonomies
Chromosome morphology
Chromosomes
Hybridity
Metaphase
Photomicrographs
Plants
Ploidies
Triploidy
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Summary:Data on chromosome numbers in eleven species and three forms of Cirsium are presented. The species treated are C. nivale (H.B.K.) Schultz Bip., C. jorullense (H.B.K.) Spreng., C. durangense (Greenman) Ownbey, C. ochrocentrum Gray, C. undulatum (Nutt.) Spreng., C. velatum (Wats.) Petrak, C. Mexicanum DC., C. rhaphilepis (Hemsley) Petrak, C. occidentalis (Nutt.) Jepson subsp. acrolepis Petrak, C. conspicuum (Sweet) Schultz Bip., and C. ehrenbergii Schultz Bip. A case of autotriploidy is reported for C. durangense. Natural hybridization between C. durangense and a form of C. mexicanum is reported. Photomicrographs of the mitotic or meiotic chromosomal configurations of nine species and two forms are reproduced. C. ochrocentrum Gray var. durangense Greenman is raised to species rank.
ISSN:0007-196X
1938-436X
DOI:10.2307/2805691