172 STATISTICS, ETC., OF HAWAIIAN PLANTS, 
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 pro- 
portion of endemic species 68:05, of introduced (recent) species, 
Of the 253 genera 39 are peculiar, and these 39 genera are repre- 
sented by 151 species, or 3:94 species to a genus, while the whole flora 
has but 2:58 species to each genus; thus showing the important part 
which these genera take in constituting the whole pheenogamous 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. TAn eg in South Seas and 
me either to be reduced to ustralasia 
Pelea, or if not, entirely Austra- ama species very peculiar. 
lasian. Cyrtandra, — in the South 
Pittosporum, largely Australasian. Seas and Moluccas: large genus in 
oprosma, a marked New Zealand the Hawaiian Islands, 
, type. Cyathodes, Australasian 
Acacia, an Australian phyllodinous Wikstremia, many species Hawaiian, 
species, represented in South Seas and Aus- 
Gouldia, one other species in Pacific, tralasia. 
ret New Zealand and Aus- Santalum, Western Pacific. 
"Exocarpus, Australasiaand Moluccas. 
Bipcibnta mostly Hawaiian, a few Astelia, 3i js 
in Mexico. 
These sixteen genera comprise 76 species, or 4°75 to a genus, thus 
taking an important place in the flora. 
All the species of the following families are peculiar to the group, 
omitting, of course, species known to be introduced. 
Ranunculacee. Portulacacee 
—Menispermacee. —Camelliacese 
Crucifers. —Tiliac 
Violacese. niacese 
—Bi * 
Pittosporacere. —Aquifoliacese, 
Caryophyllacew. A lastraceze. 
