28 Di?ecfo?'s Anmial Report. 



man, and point out briefly some of the interesting points connected 

 with the particular plant and its related species; and in some 

 cases this is supplemented with drawings illustrating the flowers 

 when inconspicuous. To other specimens have been added casts 

 of fruit made by Mr. J. W. Thompson. All of the botanical 

 exhibits have been moved from the first to the second gallery in 

 Hawaiian Hall. 



"In addition to the short trips on this island, two longer trips 

 were made to other islands of this group. The first was a trip to 

 the island of Molokai as the guest of Mr. G. P. Cooke, the journey 

 being made both ways in this gentleman's private launch. About 

 two weeks were spent on the island, and plants collected from 

 Keomumu to the western end. It was interesting to note the 

 various changes which have taken place in the flora, since the 

 previous visit in 1912. Perhaps one of the most interesting was 

 the spread of two species of introduced Atiiplex, one on the west- 

 ern end, the other in the kiawe belt near Kaunakakai. Especial 

 thanks are due Mr. Cooke for his many kindnesses and aid to my 

 department. 



"The second long trip was to the island of Hawaii, primarily 

 to continue investigations of the plant invasion on lava flows 

 begun several years ago. For economical and other reasons these 

 trips into regions new to me must cover all lines as much as 

 possible; so a large number of plants were collected, and notes 

 taken on the flora as a whole. While outfitting in Hilo, which 

 was my base, several visits were made to surrounding regions, one 

 especially pleasurable one being made with Mr. D. Thaanum, 

 who very kindly explained how to collect land shells in the parti- 

 cular region. 



"The terminal portion of the 1880-1881 lava flow is in Hilo, 

 and on account of the much greater rainfall the vegetation on it 

 is much more luxuriant than on the flows of known date on the 

 dry or Kona side of this island. However, I find that the conclu- 

 sions arrived at after a field study of the Kona flows, hold true in 

 all important essentials for the flows on this side of the island. 

 At the lower elevations on the Hilo side the place of Polypodiuni 

 pellucidum is taken by Nephrolepis exaltata. The amount and 

 luxuriance of vegetation is much greater, as was to be expected, 

 plant societies already being established on the flow of 1 880-1 88 1. 



[■44] 



