Physaria scrotiformis (Brassicaceae), a New High-Elevation Species from Southwestern Colorado and New Combinations in Physaria Sltcve L. O'Kane Jr.D)epairlnmnt of Biology, lniversity of Northern Iowa, Cedar Falls, Iowa 50614-0421, U.S.A. stcvc.okane Lnim.ed(iiAISTIRAI. PhIs.ri. scrotiformi.y (O'Kane (Brassica-ceae) is a newly described, diminutive, long-livedperennial from lthe upper sutlalpine-lower alpine zoneof tie San .Juan Mountains of soitlhvwslern (Colorado.The species grows on windlswept, nearly barrenexpostures of Leadville limestone on Weslt SilverMesa. The species is anotlier example of a laxonbridging Ile gap lelween the sy.nonmvized generaI'0squerellIt S. \Watso and Physlria (Nultall ex Torrey& A. Cray) A. Gray s. sir. Addilionally, the followingnew comlilnations and changes in status are made andkeys are provided wheret needed: P. c(rinlta (lollins)O'Kane & Al-Slihlaz suhlsp,. ptisonii (lollins)'Katne, I'. carintla (lollins) O'Kane & Al-Shlieliazsunlbs. plchelMla (lollins) ('Kane. P. didyniocarpf(Hooker) A. Gray sublsp. lanata (A. Nelson) ()'Kane,P. dlidtyiiocarpt( (I looker) A. Cray sulsp. l/yrat (C. I,.Ilitlclihck) ()'Kane. /P. floribhuind llydlerg siisp.iistcrhoutii (Payson) (O'Kane P. ge. cri (Hlooker) A.(ray subspl). pirp>ure (lollins) ('Klanei. P hilchcockii(Miniz) O'Kane & Al-Shliel)az sni)sp. coofluiens(Maguire &' A. II. I olmglren) ()'Kane, P. kingii (S.Walson) ('Kane & Al-Sheliaz sulusp. kuihbbensis(lollins) ()'KaneI, . ,in l.' i (S. Watson) (YKain & Al-Shelitz sul)s>. ntiche'nsis (liydliherg) O'Kane, P.lepidotu Rollins subsp[. incmbranacca (Hollins)O'Kane, P'. nc elrryi A. GraV snlbsp. yesicol (R. C.Sivinski) O'Kane, and P. sovximronotn Rolllis sul)sp.dcntita (Hollins) (O'Kane. KI' mtorls: lirassicaccaet, (Clorado. IlC:N IedList. Le'sqI'rella, North America. Phvysaria. Iligh-clevation specie.s of Phliysaria (Nnltall exTorrey &c A. Gray) A. Gray are found in Montana.Idaho, \\ vomiiig. /Itali. Nevada, andl central Coloradoin the vwestern United States. These rare speciesinhabit windswept, fell-field habitals witll stoiny orgravelly substlrates founied primarily fromi limestone,dolomite, or metamorphlic derivatives of thiese. Mostothiler species of the genus grow in arid, usually warmlor ho, lower-elevation habitals. In the Saln JuanMountains of southwestern Colorado, limestone in lieupper subalpine or alpine is rare (Westeri n Geo-graphics, Ioo1; Steven el al.. 1971). A new species ofll'hi1aria was dliscover icl in these miountains in thesttImtier olf 2006) by Ke'n leil, Dave Jamiieson, an(d ielwhile conduclting the final fieldwork toward thecoimpletiou oif the Flora of the Foiir Cornlers lproject(Ieil & O'Kalne 2003). Recent fieldwork in lhe Four(:Corners area (whi'ere Arizona, Collortio, New Mexico.and Utlah meet) has vieldel three otlier novelties inPhI Y.suri: P. pu/rinalt O'Kane & lReveal and P. rictiu(. L. I Anel-rson, Revlxal & Rollins) O'Kante AI-Shliihaz at imontane elevations (Ad erson et al., 997;O'Kane &. leveal. 20(10). vitan P. nuoajocnsis (O'Kanie)O'Kane \& \l-Shehbz at lower. drieri ele vations(O'Kane. 1999). It is nol surprising hiat thebolanically little-explored San Juani Mounitains wouldcontain anotlhr oltanical noveltv. New comblinations anl status chan-e ges in Plhivsriuare given following tlie discussiomn of the new speciesin order thal they may lie includedl in an upcomingIvolume of llie Flora of W 'or/h Americhc. These actionsare necessitated because of the recent Iransfer of mostspecies of lesqunerellh S. Watson lo Phiysuria (Al-Sliihehaz & ('Kane, 2002). I)islribiitions given belowarie sutllarized in Rollins (1993). Rollins and S'haw(1973). andt Holmgren (2005).Physaria se.roliforliis (iO'iKanel sp. inov. 'T' llP: .S.A\. Colorado: L[, Plata Co.. San Jiuan Mtis.. S enl of Westt Silver Mesa ca. 0.1 nmi. N of hiking trail to City Reservoir. 37'33.00(9'N, 107 37.555'W, 1l,827 ft. (3605 im). 19 July 200(), S. L. O('ane, Jr. 7977 wilh K. Heil & I). Jamieson (holotype, MO; isotlypes, ARIZ. \ASU, HRY, :COLO, CS, C11, ISTC, K, NMC, NY, IM, RSA. S.INM, UNM). Figure 1. Ilae, species PI /arice hlt'miphl siri(im (Maguire) ()'Kane& AI-Sheliiaz siniilis, s-iI ah ea lamina Ivo liiari ad petilimniminuis suibihi alitenlata at(u I'runclus valv is non compreii ssislislinguilur. Herbs, long-lived plerennials fromi a simple orsparsely branched underground calvtex, to 3.5 im x8 nill. elongating with age, distall witih a short tihatchof old leaf bases; stems (0)1 to S per planl. 0.8-3 cm.inbranchedi. purple-green. arising lalteral to (beneath)NovoN 17: 376-382. IP Lt .isttt: ON 10 S ri.tt:itM ll 2007.
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