764 MINNESOTA BOTANICAL STUDIES. 



Tetramolopium ranges over all of the islands, but is most 

 abundant on Maui and Hawaii, only one species finding its way 

 to Kauai. Lipochaeta, which may be considered a Hawaiian 

 genus, ranges over all of the islands, but principally from 

 Hawaii to Oahu. The same may be said of Campylotheca. 

 Argyroxiphium is confined to the high mountains of Maui and 

 Hawaii. Wilkesia is represented by two species, one on Kauai, 

 and one on Maui. Dubautia is confined principally to Kauai, 

 four of the six species being found there, while none occur on 

 Hawaii. Raillardia, on the contrary, is found principally on 

 Hawaii, with one species on Kauai. Hesperomannia is of cen- 

 tral distribution, occurring on Lanai Maui, and Oahu. 



Jn the Lobeliaceae, Clermontia is of central distribution, few 

 species being found on Kauai and Hawaii. Rollandia is found 

 only on Oahu. Dellissea is northern in range, growing prin- 

 cipally on Oahu and Kauai, with one species on Hawaii. 

 Cyanea, with about thirty species, occurs on all of the islands, 

 but is most abundant on the islands of Maui and Hawaii, thus 

 being principally of southern distribution. 



Of the Labiatae, Haplosiachys is central or southern, rang- 

 ing from Molokai to Hawaii, with a form on Kauai. Phyllos- 

 iegia predominates on Hawaii and Maui, with a few species on 

 Molokai, Oahu, and Kauai. The same is true of Sphacele, 

 except that even fewer species are found on the northern 

 islands. 



Besides these larger genera, there are smaller ones, which 

 have representatives only on the northern islands, and when 

 they are taken into account, the endemic species are found to 

 be pretty evenly distributed over the entire group. But we 

 also find that in the larger and more differentiated genera, the 

 greatest number of species are found on the later formed 

 islands of Maui and Hawaii, where also the greatest elevations 

 are found. 



The great number of ferns appeal to the eye of the botanist, 

 when he ascends to the region of native vegetation. Omitting 

 the lower cryptogams, they comprise one sixth of the native 

 vegetation. The comparative scarcity of grasses, Compositae, 

 and Leguminosae, in opposition to the unusually large number 

 of Rutaceae, Rubiaceae, Lobeliaceae, and Labiatae, is a matter 

 of astonishment to the collector from more temperate regions. 



To the student of the lower cryptogams, an immense field is 

 open. Near the summits of the mountains, and in other places 

 where there is a large amount of moisture, the trees, bushes 



