Abstract

Six new varieties are proposed in North American Cirsium (Asteraceae: Cardueae): C. arizonicum (A. Gray) Petrak var. tenuisectum D.J. Keil var. nov., C. eatonii (A. Gray) B.L. Rob. var. viperinum D.J. Keil, var. nov., C. edule Nutt. var. wenatchense D.J. Keil, var. nov., C. occidentale (Nutt.) Jeps. var. lucianum D.J. Keil, var. nov., C. scariosum Nutt. var. robustum D.J. Keil, var. nov., C. scariosum Nutt. var. toiyabense D.J. Keil, var. nov. Additionally, twenty new combinations are presented: C. arizonicum (A. Gray) Petrak var. bipinnatum (Eastw.) D.J. Keil, comb. nov., C. arizonicum (A. Gray) Petrak var. chellyense (R.J. Moore & Frankton) D.J. Keil, comb. et stat. nov., C. arizonicum (A. Gray) Petrak var. rothrockii (A. Gray) D.J. Keil, comb. et stat. nov., C. clavatum (M.E. Jones) Petrak var. americanum (A. Gray) D.J. Keil, comb. nov., C. clavatum (M.E. Jones) Petrak var. osterhoutii (Rydb.) D.J. Keil, comb. et stat. nov., C. cymosum (Greene) J.T. Howell var. canovirens (Rydb.) D.J. Keil, comb. et stat. nov., C. eatonii (A. Gray) B.L. Rob. var. eriocephalum (A. Nelson) D.J. Keil, comb. nov., C. eatonii (A. Gray) B.L. Rob. var. hesperium (Eastw.) D.J. Keil, comb. et stat. nov., C. eatonii (A. Gray) B.L. Rob. var. peckii (L.F. Hend.) D.J. Keil, comb. et stat. nov., C. eatonii (A. Gray) B.L. Rob. var. var. clokeyi (S.F. Blake) D.J. Keil, comb. et stat. nov., C. edule Nutt. var. macounii (Greene) D.J. Keil, comb. et stat. nov., C. horridulum Michx. var. megacanthum (Nutt.) D.J. Keil, comb. et stat. nov., C. inamoenum (Greene) D.J. Keil, comb. nov., C. inamoenum (Greene) D.J. Keil var. davisii (Cronquist) D.J. Keil, comb. et stat. nov., C. ochrocentrum A. Gray var. martinii (P. Barlow-Irick) D.J. Keil, comb. et stat. nov., C. pulcherrimum (Rydb.) K. Schum. var. aridum (R.D. Dorn) D.J. Keil, comb. et stat. nov., C. scariosum Nutt. var. americanum (A. Gray) D.J. Keil, comb. nov., C. scariosum Nutt. var. citrinum (Petrak) D.J. Keil, comb. nov., C. scariosum Nutt. var. coloradense (Rydb.) D.J. Keil, comb. et stat. nov., C. scariosum Nutt. var. congdonii (R.J. Moore & Frankton) D.J. Keil, comb. et stat. nov. Lectotypes are designated for several of these taxa.

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URL: http://digitalcommons.calpoly.edu/bio_fac/197