459] 



3" 



References to the Flora are in brackets f 1 



sandbar, silky [99] 



Wolf's [99] 



yellow [99] 



Willow family. 

 Willow-herb 



alpine 



great 



northern 



panicled 



glandular 



pimpernel 



reddish 



western 



Willow-herb family. 

 Winter cress 



American 



Wintergreen 



[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] 



creeping 



one-flowered 



one-sided 



Wintergreen family.. 



Witch grass 



Wood reed-grass 



slender 



Wood rush 



dense-cymed 



small-flowered 



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] 



effuse [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] 



Xi7nenesia exauriculata [244] 



Xylophacos [157] 



Parryi 30, [157] 



Shortianus IS, [157] 



Xyridales [87] 



Yarrow [246] 



woolly [246] 



Yellow cress [129] 



spreading [129] 



warty-podded [129] 



Yellow mountain avens [146] 



Arapahoe [146] 



Yellow pond Hly 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 



Zones of vegetation 



alpine summits 



foothills and mountain pla- 

 teau 



lower mountain slopes 



mesas 



plains 



subalpine mountain slopes.... 



Zygademis elegans 



Zygadenus 



Colorado 



showy 



[55] 



[88] 



