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<br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />EO <br />t; <br />Z <br />"' <br />:0 60 <br />~ <br />"' <br />.., 40 <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />EO <br />t; <br />z <br />"' <br />:0 60 <br />~ <br />"' <br />~ 40 <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />001578 <br /> <br />100 <br /> <br />A-Achi Z lea lanu'tosa <br />G=Geranium richardsonii <br />H=Hap~OpappU8 parryi <br /> <br />100. <br /> <br />C=CampanuZa rotundifoUa <br />F""Fpagaria virginiana <br />p=Polemoniwn puZcherrimum <br />V=Vaccinium spp. <br /> <br />20 <br /> <br /> <br /> <br />EO <br />1:; <br />z <br />., <br />:0 60 <br />~ <br />"' <br />IN! 40. <br /> <br />20 <br /> <br />o <br /> <br />.2 .4 .6 <br />SNOW DURATION <br />(a) <br /> <br />.E <br />INDEX <br /> <br />1.0 <br /> <br />o <br /> <br />.2 .4 .6' .E <br />SNOW DURATION INDEX <br />(b) <br /> <br />1.0 <br /> <br />100 <br /> <br />A=Arni~a cordifolia <br />B=BromHs ci Ziatus <br />V"Lu.3uJ,a parvifZora <br />v=Vicia americana <br /> <br />EO <br />t; <br />z <br />"' <br />g. 60 <br />f;l <br />"' <br />t-! 40 <br /> <br />E <br /> <br />100 <br /> <br />E=Erigel'on spp. <br />P=Pseudocymopteris montanus <br />S=Syrrrphol'iaarpo8 oreophiZu8 <br />V=Viola canadensis <br /> <br />/., <br /> <br /> <br />20 <br /> <br />v <br /> <br /> <br />20 <br /> <br />.... <br /> <br />o <br /> <br />.2 .4 .6 <br />SNOW DURATION <br />(e) <br /> <br />SNOW DURATIQN INDEX <br />(d) <br /> <br />.E <br />INDEX <br /> <br />1.0 <br /> <br />o <br /> <br />.2 <br /> <br />.4 <br /> <br />.6 <br /> <br />.& <br /> <br />1.0 <br /> <br />Figure 1. Relation of some understory species frequencies to the Snow Duration Index. <br /> <br />16 <br />