132 THK PI.ANT WORI.D 



The seeds are not produced until very late in the season, and unless 

 planting be done early, no seeds will ripen. The foliage is not injured 

 by the first frosts, remaining green until hard freezing weather begins. 

 During the season of 1902 it was noted that specimens growing on the 

 Potomac Flats withstood, without apparent injur>^ a temperature of 

 28° F., at which time the ground was slightly frozen. The plants were 

 not actually killed until after the thermometer had gone as low as 22°. 



The color of the entire plant is of deep green, sometimes with a bronze 

 tinting on the stems. When the foliage is disturbed by the wind it has 

 a silvery or frosty appearance due to the presence of innumerable small 

 plant hairs on the under side of the leaves. On a warm day and with a 

 light wind blowing there are few things more pleasing to the eye than a 

 field of growing hemp. 



Indian Hemp is not well known to the American seed trade, and when 

 ordering seed it should be clearly stated that it is this species that is 

 wanted. The seed is also very scarce and the price correspondingly high, 

 but as a rule a few seeds are all that will be required. 



A Collecting Trip to Bolivia.* 



By R. S. Williams. 



lyEAViNG New York July 9, 1901, I took a through steamer to Colon, 

 crossed the isthmus to Panama, where I met the other three members of 

 our party, and proceeded down the South American coast to Mollendo, 

 the chief port by which one enters Bolivia, landing at that place August 

 4, twenty-six days out from the city. 



From Mollendo an excellent railway to Lake Titicaca carries one in 

 eight or ten hours to Arequipa, at an elevation of 7,500 feet. The first 

 part of the route and up over the first hills to an elevation of between 

 3,000 and 4,000 feet has considerable vegetation, small trees or bushes 

 growing along the few streams and various shrubby plants, grasses, etc., 

 on the hillsides and in the ravines. After ascending this first range the 

 road passes through a comparatively level tract that seems to be an 

 absolute desert, extending over many hundreds of square miles. From 

 the train there was nothing living to be seen, either plant or animal, as 

 far as the eye could reach in all directions, except along the track at the 

 stations. It is in this desert that the curious moving sandhills occur. 

 Apparently the higher winds all blow from one direction, sift out the 

 light colored sand, lighter also in weight, from the darker sand and 



* Condensed from the Journal of the New York Botanical Garden. 



