Wagner85: W. L. Wagner, R. E. Stockhouse, W. M. Klein. 1985. The systematics and evolution 



of the Oenothera caespitosa species complex (Onagraceae). Monogr. Syst. Bot. Missouri 



Bot.Gard. 12: 1-103. 

 Wagner07: W. L. Wagner, P. C. Hoch, P. H. Raven. 2007. Revised classification of the 



Onagraceae. Syst. Bot. Monogr. 83: 1-240. 

 Weber82: W. A. Weber. 1982. Mnemonic three-letter acronyms for the families of vascular 



plants: a device for more effective herbarium curation. Taxon 3 1 : 74-88. 

 Welsh03: S. L. Welsh, N. D. Atwood, S. Goodrich, L. C. Higgins (Editors). 2003. A Utah Flora. 



Third edition, revised. Brigham Young University, Provo, UT. 

 Wen98: J. Wen, S. Shi, R. K. Jansen, E. A. Zimmer. 1998. Phylogeny and biogeography of 



Aralia sect. Aralia (Araliaceae). Amer. J. Botany 85: 866-875. 

 Windham06: M. D. Windham, I. A. Al-Shehbaz. 2006. New and noteworthy species of Boechera 



(Brassicaceae) I: Sexual diploids. Harvard Papers in Botany 11: 61-88. 

 Windham07a: M. D. Windham, I. A. Al-Shehbaz. 2007. New and noteworthy species of 



Boechera (Brassicaceae) II: Apomictic hybrids. Harvard Papers in Botany 1 1: 257-274. 

 Windham07b: M. D. Windham, I. A. Al-Shehbaz. 2007. New and noteworthy species of 



Boechera (Brassicaceae) III: Additional sexual diploids and apomictic hybrids. Harvard 



Papers in Botany 12: 235-257. 

 Wolf79: S. J. Wolf, J. G. Packer, K. E. Denford. 1979. The taxonomy of Minuartia rossii 



(Caryophyllaceae). Canad. J. Bot. 57: 1673-1686. 

 Yuan96: Y.-M.Yuan, P. Kttpfer, J. J. Doyle. 1996. lnfrageneric phylogeny of the genus Gentiana 



(Gentianaceae) inferred from nucleotide sequences of the internal transcribed spacers (ITS) 



of nuclear ribosomal DNA. Amer. J. Botany 3: 641-652. 

 Zomlefer94: W. B. Zomlefer. 1994. Guide to Flowering Plant Families. The Univ. of North 



Carolina Press. Chapel Hill & London. 

 ZomleferOl: W. B. Zomlefer, N. H. Williams, W. Mark Whitten, W. S. Judd. 2001. Generic 



circumscription and relationships in the tribe Melanlhieae (Lilales, Melanlhiaceae). with 



empahsis on Zigadenus: Evidence from ITS and trnL-F sequences. Amer. J. Botany 88: 



1657-1669. 

 Zomlefer02: W. B. Zomlefer, W. S. Judd. 2002. Resurrection of segregates of the polyphyletic 



genus Zigadenus s.l. (Liliales: Melanthaceae) and resulting new combinations. Novon 12: 



299-308. 

 Zuloaga07: F. O. Zuloaga, L. M. Giussani, O. Morrone. 2007. Hopia, a new monotypic genus 



segregated from Panicum (Poaceae). Taxon 56: 145-156. 



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