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12 BRITTONIA IvoL. 36
<br /> on lower shelf of floodplain on N side of Clear Creek.W of bridge near intersection of US 6,Colorado
<br /> 58, and County Road 93. 6 Sept 1980. R. A. Bic. Jr 9769 (COLO), alluvial meadow along Clear
<br /> Creek.growing in 3' of water when originally collected, coil. 1981. 11'. Ganihili& H. Jrnnings s.n,
<br /> bloomed in hors. 1982. C.J. Sheriak 2124(NYSI:mesic to wet alluvial meadows along Clear Creek
<br /> just W of junct, rts. 6& 58. Golden. 2 Aug 1982. C. J.Shetiok 2313(NYS). NEVADA. Lincoln Co.:
<br /> wet meadow, Panaca,4750 ft. 14 Jul 1936, D. 11n11 s.n.(BRY). UTAH. Daggen Co.:T2N, R24E,NW
<br /> V.S23.beside Green River,al Taylor Flat Bridge in Browns Park Area.5500 R elev.,riparian comm..
<br /> wet soil. 20 Jul 1978.E.Neese 6265(BRY);moist alluvial meadows along Green River below Taylor
<br /> Flat Bridge, collected in bud 24 Jul 1982, "b"& "c•' bloomed in hon. 8 Aug 1982, C. J. Sheriak
<br /> 2293(NYS). Garfield Co.:T33S. R6E. S32, Deer Creek on Burr Trail,6000 ft elev.,pinyon-juniper
<br /> comm.,sandy sod,3 Aug 1977, E.Nrerr&S. 11'hac J927(BRY):marshy meadows and mesic terraces
<br /> along Deer Creek, vie Burr Trail bridge. W edge S13,T34S, R5E, 27 Jul 1982. C. J. Sheriak 2J00
<br /> (NYS),Salt Lake Co.:Salt Lake City.alulude 4300 ft. 17 Aug 1880,Af. E.Jones 1903(MICH,MSC.
<br /> NY, US); 39th South and I st West,wet grass,meadow,elev.4300 ft. 11 Aug 1953,L. T. Nielsen 221
<br /> (UT).Tooele Co.:Pony Express Sta.,Willow Springs.Callao,meadows,elev.4300 ft. 3 Jul 1956. If'.
<br /> P. Conant 14361(UT). Utah Co.'.Powell's Slough,wet meadows on rises where the soil is drier,Nev.
<br /> 4498, rare. 13 Aug 1963. L. B. Barns 154(BRY).Wayne Co.:Capitol Reef.T29S, R6E,S26, 5 mi
<br /> due W of Fruita along Fremont River, 5200 ft elcv., Tamanx comm., sandy soil, 3 Aug 1977, E.
<br /> Neese& S. White 3904(BR Y, DAV). Weber Co.: Ogden, 3 Aug 1887, S. U. Trail'1169& 236 on
<br /> label](MSQ; Ogden,3 Aug 1887, Trace& Emns 354(NY).
<br /> Etymology: from diltrrium. flood or deluge; hence "of the flood," in allusion to
<br /> the species' habitat, which is uncommon in an and region,and to its hypothetical
<br /> origin in a Pleistocene pluvial period.
<br /> The morphology of S.dihn•ialis reflects the plants'hybrid origin and amphiploid
<br /> condition. The high chromosome number and regular meiosis serve to restrict
<br /> variability to a rather narrow range intermediate between S. roinanulfaita and
<br /> S. niagnicamporitnt. The characteristics of S. diluvialis are hence most readily
<br /> presented in comparison with those of the parental species.
<br /> In S. magnicamporum the leaves are few,strictly basal,and fugacious, typically
<br /> withering before anthesis. In S. roman2of0Jra. the persistent leaves are often
<br /> numerous and sometimes extend up the lower portion of the stem. In S. dilulialis.
<br /> typically several of the leaves occur on the base of the stem; they persist past
<br /> anthesis. In contrast to the parental species, S. dilirriahs commonly displays a
<br /> stem disproportionately long for the length of the inflorescence. This feature is
<br /> typical of races of S. cermia which contain genes of S. nragnrcamponnn;it appears
<br /> to be a characteristic imparted to its hybrids by S. ntognicamporum. Some pop-
<br /> ulations of S. dilireialis commonly produce cespilose plants with several stems;
<br /> this feature is seen in some populations of S. romartzo(fiana,
<br /> Flowers ofS. romanzoJfiana are short,broad at the base,and strongly ascending.
<br /> They are characterized by sepals connate toward the base and united with the
<br /> petals to form a hood above the lip. The lip is membranaceous in moistened
<br /> herbarium material. strongly pandurate, and prominently veined below the con-
<br /> striction with laterally diverging,branched veins:for much of its length it is hidden
<br /> in lateral view, and only the reflexed apex is exposed. In S. nlagnicantportun,
<br /> flowers are comparatively long. slender,and abruptly nodding. The sepals are free
<br /> to the base, the lateral sepals widespreading and often ascending above the rest
<br /> of the flower. The lip is thick and fleshy when moistened, ovate to lanceolate.
<br /> without a marked constriction, and with the venation largely parallel, diverging.
<br /> branched veins, if present, being restricted to the very base; for all of its length
<br /> it is exposed to view.
<br /> Floral characters in S. dilretialis are rather variable, but the plants are readily
<br /> determined by a combination of features. The idealized plant bears ascending
<br /> flowers suggesting S. magnicanlportrrn in being rather long and slender with a
<br /> laterally exposed lip. Sepals are basally connale for a short distance and are
<br /> variably positioned, even on the same flower, being appressed to the rest of the
<br /> flower, free spreading. or ascending. A hood is only rarely evident. Lips are ovate
<br /> to lanceolate or oblong in general outline, but with a marked median constriction.
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