459] 



INDEX 



311 



References to the Flora are In brackets f 1 



sandbar, silky [99] 



Wolf's [99] 



yellow [99] 



Willow family [98] 



Willow-herb [177] 



alpine [177] 



great [176] 



northern [177] 



panicled [177] 



glandular [178] 



pimpernel [177] 



reddish [177] 



western [177] 



Willow-herb family [176] 



Winter cress [13l] 



American [131] 



Wintergreen [186] 



bog.._ [186] 



creeping [186] 



one-flowered [186] 



one-sided [186] 



Wintergreen family [185] 



Witch grass [57] 



Wood reed-grass [63] 



slender [63] 



Wood rush [90] 



dense-cymed [91] 



small-flowered [90] 



spiked [91] 



Wood sorrel [163] 



yellow [163] 



upright [163] 



Wood sorrel family [163] 



Wooded mesa formation 18 



Woodsia [50] 



Oregana 29, [50] 



scopulina 29, [50] 



Woodsia, cliff [50] 



mountain [50] 



Wool-joint 18, [104] 



Baker's [104] 



eff'use [104] 



subalpine [104] 



umbellate [104] 



winged [104] 



yellow [104] 



Wormwood [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] 



Xyridales [87] 



Yarrow [246] 



woolly [246] 



Yellow cress [129] 



spreading [129] 



warty-podded [129] 



Yellow mountain avens [146] 



Arapahoe [146] 



Yellow pon^i 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 



Zygadetius elegans [88] 



Zygadenus [88] 



Colorado [88] 



showy [88] 



