7 
• I 
In reference to the distribution of genera and species in North 
America, the fact of their uniform distribution is brought out by 
tne following data: in N. E. United States (the range covered by 
Gray’s ManuaU) there are 27 genera and 44 species; in S. E. 
United States (range of Chapman’s Manual) there are 27 genera 
and 49 species: in the Rocky Mountain region within the United 
States (range of Coulter’s Manual) there are 21 genera and 43 
species; in California (Botany ot California) there are 26 genera, 
65 species; in British North America (Macoun’s Catalogue) there 
are 28 genera and 55 species; in the Great Basin (Watson in Bot. 
King’s Report) there are 17 genera and 33 species. 
ContrastinsT the Umbelliferaj of eastern and western North 
America, the latter not only gives the greater display, but also 
presents the characteristic forms of the continent, differing far 
more from the Umbelliferae of every other continent than do those 
of E. North America. Twenty-one genera and about 150 species are 
restricted to W. North America; while but 7 genera and about 40 
species are restricted to E. North America; which shows 23 gen- 
era and about 20 species distributed both east and west. 
Only 9 species can be considered really alpine, v\z‘. Peuced- 
anunt Sandbergii^ P. Oreganum^ P. Cusickii, Cymopterus nivalis^ 
C. ternatus^ C. cinerarius^ Oreoxis humilis^ Podistera Nevadensis^ 
and Velcea Hovoe.llii\ although many species extend well up the 
mountain sides. 
The largest genus is Peucedaniini^ with 43 species, being 
more than one-fifth of our Umbellifeis. The next genus in point 
of numbers is Eryngium with 29 species; then Angelica with 16 
species; Cymopterus with 13 species; Sanicula with 10 species; and 
Ligusticum with 9 species. It will be seen that these six genera 
contain more than half of our native species. 
Our monotypic genera are Aletes, Grant zia^ Cryptotcenia^ 
Erigenia^ Eurytoenia^ Plarbouria^ Museniopsis^ Oreoxis^ Phellop- 
terus^ Podistera^ Polytoenia^ and Prcpocarpus ; while the following 
genera, in addition, are represented within our borders by but a 
single native species, viz : Apium^ Berida^ Bifora^ Bowlesia^ Bu- 
pleuruni^ Caucalis^ Choerophyllum^ Conioselinum^ Daucus^ He- 
1 In usin^ the numbers obtained from the various manuals and catalog-ues it must be 
remembered that no account is made of the slig^ht changes which have been necessary, but 
which do not affect the general conclusion. 
