202 



the species. The sheaths may be persistent or deciduous; there 

 may or may not be thorn}' leafless axillary branches; there may 

 be short accessory leaf-bearing branches. In one extreme, the 

 result is a leafy tangle or jungle of thorns, in which the main 

 stems are almost invisible and quite unapproachable ; in the other 

 the perfectly smooth jointed stems bearing leaves only near the 

 top. Bambusa Blumena, the common building material of the 

 Philippine Islands, is of the former type, Dendrocalamus giganteus 

 of the latter. 



{To be continued) 



SOME PLANTS FROM THE VICINITY OF THE • 

 ARAPAHOE GLACIER. 



By T. D. a. Cockerell 



Looking west from the town of Boulder, Colorado, up Boulder 

 Canyon, the skyline is formed by the Arapahoe Peaks, with the 

 highest summit some 13,500 feet above sea level. On the face 

 of this mountain is a large white area, the Arapahoe glacier; 

 now greatly reduced from its original size, but still a moving 

 mass of ice. The glacier is at the end of a narrow valley, occu- 

 pied by quantities of morainal matter, the successive deposits 

 of which, crossing the valley, have given rise to a series of small 

 lakes. The lakes or ponds near to the glacier are of a most 

 beautiful green color, presumably due to the suspension of ex- 

 ceedingly fine particles, ground by the slowly moving ice. On 

 the south side of the valley or gulch, extending eastward from 

 the peaks, is an enormous upland area, in places very rocky, 

 with one especially large rounded elevation known as Baldy 

 Mountain. This region is all above timber line, with elevations 

 of between 11 and 12 thousand feet. It is bounded below by 

 the dense forests of the Hudsonian Zone, consisting mainly of 

 Engelmann spruce. On July 24, 1915, the Arapahoe Peaks 

 were visited by the summer school of the University of Colorado. 

 Accompanying the expedition, I did not attempt to climb to the 

 highest point, which offers nothing of botanical interest, but 

 contented myself with exploring, as well as the time permitted, 

 the elevations extending along the south side of the gulch. 



