42 VEGETATION IN COLORADO-HOLM. [Memoes national 



wind, Dryas, Sieversia and the Compositae, or the seeds may be adapted for dissemination by 

 the wind, as in Epilobium, Chamaenerium, and Salix. To these may be added several of the 

 Gramineae, notably Calamagrostis, Deschampsia, and Festuca. 



The structure of the flower is in the majority of the Dicotyledones actinomorphic, the 

 proportion of the species exhibiting this type, actinomorphic, and those with the flowers 

 zygomorphic being 2:1. 



With regard to the color of the flowers, white is undoubtedly the predominant. Next to 

 this comes, evidently, yellow, while blue is rare (Polemonium, Eritrichium, Pentstemon), and 

 pink is less common than purplish (Pedicularis, Trifolium, Erigeron, Primula, etc.). The 

 leaves are mostly entire, but lobed, laciniate, and decompound leaves are also quite well rep- 

 resented, for instance, in the Ranunculaceae, Rosaceae, Papilionaceae, Umbelliferae, many 

 Compositae, Polemonium, etc. The glabrous leaf seems to be more frequent than the hairy. 

 Succulent leaves are well exemplified by Claytonia, Calandrinia, Saxifraga flagellars, Chionophila, 

 and Mertensia alpina. 



These structures represented by the organs of vegetative reproduction, by the fruits, the 

 seeds, the flowers, and the leaves, are essentially identical with the corresponding possessed 

 by the Arctic plants. 



