459] 



INDEX 



3" 



References to the Flora are in brackets \ 1 



sandbar, silky 



Wolf's 



yellow 



Willow family 



Willow-herb 



alpine 



great 



northern 



panicled 



glandular 



pimpernel 



reddish 



western 



Willow-herb family 



Winter cress 



American 



Wintergreen 



bog. ._ 



creeping 



one-flowered 



one-sided 



Wintergreen family 



Witch grass 



Wood reed-grass 



slender 



Wood rush 



dense-cymed 



small-flowered 



spiked 



Wood sorrel 



yellow 



upright 



Wood sorrel family 



Wooded mesa formation 



Woodsia 



Oregana 29, 



scopulina 29, 



Woodsia, cliff 



mountain 



Wool-joint IS, 



Baker's 



effuse 



subalpine 



umbellate 



winged 



yellow 



Wormwood 



[99] 



[99] 



[99] 



[98] 



177] 



177] 



176] 



177] 



177] 



178] 



177] 



177] 



177] 



176] 



131] 



131] 



186] 



186] 



186] 



186] 



186] 



185] 



[57] 



[63] 



[63] 



[90] 



[91] 



[90] 



[91] 



[163] 



[163] 



[163] 



[163] 



18 



[50] 



[50] 



[50] 



[50] 



[50] 



[104] 



[104] 



[104] 



[104] 



[104] 



[104] 



[104] 



[246] 



biennial [247] 



Wyethia... . [242] 



amplexicaulis [242 



Wyethia, clasping-leaved [242 



Wyomingia [239 



cana 16, [239 



Xanthium [225] 



commune 12, 45, [225] 



Xanthoxalis [163] 



stricta 25, [163] 



Ximenesia exauriculata [244] 



Xylophacos [157] 



Parryi 30, [157] 



Shortianus 15, [157] 



Xyridal.es [87] 



Yarrow [246] 



woolly [246] 



Yellow cress [129] 



spreading [129] 



warty-podded [129] 



Yellow mountain avens [146] 



Arapahoe [146] 



Yellow pond lily 24, [125] 



many-sepalled [125] 



Yellow wood sorrel [163] 



upright [163[ 



Yucca [94] 



angustifolia [94] 



glauca 15,18,20, [94] 



Yucca 12,13, 19 



Yucca mesa formation 18, 19 



Zanichellia [56] 



palustris 10, [56] 



Zanichellia, marsh [56] 



Zanichelliaceae [55] 



Zones of vegetation 8 



alpine summits 9 



foothills and mountain pla- 

 teau 9 



lower mountain slopes 9 



mesas 9 



plains 9 



subalpine mountain slopes.... 9 



Zygadenus elegans [88] 



Zygadenus [88] 



Colorado [88] 



showy [88] 



