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flowers, but otherwise the plants were exactly alike. The 

 white flowers do not show any blue at all in life, but on 

 drying the ends of the corolla lobes turn bluish, showing 

 that anthocyan is not entirely absent. 



17. Eritrichium argenteum Wight {"argentum White" in Ryd- 



berg). Common above timber line, the flowers the 

 brightest possible blue. 



18. Pentstemon glaucus Graham. Not very common along the 



trail above Longs Peak Inn, at about 10,000 ft. (Hudsonian 

 Zone). In life this is a very curious and singularly in- 

 conspicuous species, the flowers a sort of dark purplish 

 red. Herbarium specimens give no good idea of its true 

 appearance. Our plant is glaucus, not stenosepalus. 



19. Castilleja occidentalis Torrey. A small, very inconspicuous 



species, with orange-tipped bracts (no sign of red), was 

 common above timber line. I suppose it to be occidentalis, 

 but we have in the University of Colorado herbarium 

 specimens of a different plant, a reduced form of C. 

 sulphur ea or very close thereto, determined as occidentalis 

 by Nelson. 



20. Castilleja, hybrid? Near Longs Peak Inn we found a 



number of plants of C. sulphur ea Rydb. (here using the 

 name, with Nelson, to include luteovirens) , and along with 

 them some variable forms which were taken, in the field, 

 to be hybrids with C. confusa Greene. A characteristic 

 example of the supposed hybrid has the bracts greenish 

 yellow, broadly tipped with pale red. The foliage does 

 not differ at all from that of sulphurea; thus the leaves 

 are too broad for confusa. The stem is hairy, which is 

 not true of sulphurea. The reddest plants found at this 

 particular spot have the calyx deeply cleft in front and 

 behind, but only briefly so at the sides, thus not according 

 well with confusa. It is possible that all the plants 

 colored with red should be referred to C. rhexifolia Rydb., 

 which may in fact be of hybrid origin. I should hardly 

 offer these notes on Castilleja, except to point out the 

 necessity for further study in the field. Nelson and 



