532 HORACE MANN ON HAWAIIAN PLANTS. 



tunately little-known Sclerotheca arlorea. D C. [Lobelia arborea, Forst.) of Tahiti. In that, 

 however, so far as is made out, the corolla is no longer than the foliaceous calyx-lobes, and 

 cleft to the base, and the capsule opens at the vertex by two round pores. The one-flowered 

 peduncle is of small moment, as it is bibracteolate. 



Mr. Brigham found this very interesting lobeliaceous plant on the side of steep, rocky 

 cliffs near Halawa, on the eastern end of the island of Molokai. Remy's specimens were 

 marked "Kauai or Niihau," and the former island is certainly its habitat, while in all proba- 

 bility it is not found on Oahu, the intervening island. The juice of the stem is rather 

 watery, and shows none of the glutinous, milky exudation which is so general with the other 

 Hawaiian Lobeliaceoa. 



Statistics and Geographical Range of Hawaiian Plants. 



The Hawaiian Islands have a surface of about 4000 square miles, situated just within the 

 tropics, and more than one thousand miles from any other land except a few rocks lying to 

 the northwest, bare of vegetation, and inhabited by sea-fowl and seals. On this area, which 

 includes an excessively dry and hot, a very wet and very hot, and from these every other 

 variety to a very dry and very cold climate, is found a Flora of 620 species of flowering 

 plants 1 and ferns, of which the former comprise 485 species, the latter 135; the mosses, 

 lichens, and alo-te berny- left out of consideration as too little known. 



Of the 554 flowering plants, including 69 species supposed or known to be introduced, 

 479 species belong to the Dicotyledons, and the remaining 75 to the Monocotyledon.**?, in 

 the proportion of nearly 100 to 15. These 554 flowering plants are divided among 253 

 genera, giving to each genus on an average 2.58 species. There are 87 natural orders of 

 flowering plants represented in the group. Of the 554 flowering plants 377 are peculiar 

 to the Group, while 42 are of recent and 27 of supposed aboriginal introduction, giving the 

 proportion of endemic species 68.05, of introduced (recent) species, 12.46. 



Of the 253 genera 39 are peculiar, and these 39 genera are represented by 151 species or 

 3.94 species to a genus while the whole flora has but 2.58 species to each genus ; thus show- 

 ing the important part which these genera take in constituting the whole phamogamous flora. 



Among the genera not peculiar to the islands, there are sixteen, of which the species 

 belong to a distinct group in the genus or which are most largely represented in the South 

 Pacific islands and Australia, or on the Hawaiian Islands themselves. 



Geranium, very peculiar species. 



Melicope, either to be reduced to Pelea, or if not, entirely Australasian. 



Pittosporum, largely Australasian. 



Coprosma, a marked New Zealand type. 

 Acacia, an Australian phyllodinous species. 



Gouldia, one other species in Pacific. 



Vittadinia, New Zealand and Australia. 

 LipochcBta, mostly Hawaiian, a few in Mexico. 

 Sccevola, mostly in South Seas and Australasia. 

 Lobelia, species very peculiar. 



Ctjrtandra, represented in the South Seas and Moluccas : large genus in the Hawaiian Islands. 



( k/athodes, Australasian. 



Wiclcstraimia, many species Hawaiian, represented in South Seas and Australasia. 



1 Omitting Graminem which have not yet been fully studied. 



