The Cirsium arizonicum complex of the southwestern United States
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The morphology, cytology, distribution, and phylogeny of eight species of the southwestern United States closely related to Cirsium arizonicum are considered. These species form a natural group distinguished from other North American species of Cirsium by a short stigma (1–3 mm) and long corolla lobes (10–20 mm) which are longer than the corolla throat. Three new species described are C. chellyense, C. chuskaense, and C. navajoense. Original chromosome counts are presented for C. nidulum, 2n = 34; C. rothrockii, 2n = 30; C. arizonicum, n = 15; C. chuskaense, 2n = 34; and C. arizonicum × nidulum, 2n = 32, 34.
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1992 ◽
Vol 124
(6)
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pp. 1063-1074
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1982 ◽
Vol 19
(5)
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pp. 605-614
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1963 ◽
Vol 56
(5)
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pp. 573-576
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2007 ◽
Vol 3593
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pp. 1-30
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