290 UNIVERSITY OF COLORADO STUDIES 



and two plants had flowers with white sepals. The sepals are usually 

 of the same size, but a few flowers had three large sepals alternating 

 with three smaller ones. In one instance a single sepal of normal 

 size was accompanied by five which were very minute. Two flowers 

 had all the sepals extremely small. 



Stamens and nectar glands show certain variation. In two 

 young flowers no anthers were present on the longer stamens, though 

 present on a very few of the shorter ones. There was, however, 

 the usual row of nectar glands. The same condition was foimd to 

 exist at times in older flowers, but here it is possible that the anthers 

 may have fallen off. In a few of the older ones there were no anthers 

 or nectar glands. One comparatively young flower had no nectar 

 glands and very few anthers. Those that were present were on the 

 medium-sized stamens, while the longer and shorter filaments were 

 completely without anthers. 



Doubling occurred in two instances. Both flowers were found 

 in the same cluster with some blossoms having the regular number 

 of parts. One had twelve purple sepals narrower than the usual 

 ones, being 2 . 5 cm. long and 8 mm. wide. Stamens and carpels 

 were numerous, but no nectar glands were present. The flowers had 

 two involucres, one 2.4 cm. below the flower, and the other 3 cm. 

 below the first. The upper involucre was divided almost to the base 

 into six segments, each of which was variously cleft and lobed. One 

 of the segments was colored like the sepals and was three lobed 



(Fig. 3)- 



The other flower had eleven sepals 3 cm. long and 7 mm. wide. 

 Two involucres were present, the lower one regular and 3 cm. below 

 the upper. The flower was almost sessile upon the upper involucre, 

 one of the four segments of which was formed by one of the eleven 

 sepals of the flower. No nectar glands were found (Fig. 4). 



Professor T. D. A. Cockerell has kindly given the writers an 

 account of a specimen found by one of his students. The flower- 

 stalk was jointed some distance below the flower and at the joint 

 there was a single sepal. The flower was regular and a normal 

 involucre was present some distance below the joint. 



