ft 
genera, six are restricted to North America and Asia, viz: C'celo'- 
pleurum^ Comoselinuni^ Cryptotcenia^ Discopleura^ Osniorhiza^ 
and Phelloptcr7is\ no genus is restricted to North America and 
Europe; four genera are common to the whole northern hemi- 
sphere, not extending southward, viz: Chcerofhyllmn, Cicuta, 
Heracleiim^ and Ligusiicum \ three genera extend only into Mexi- 
co and South America, viz: Apiastrum, Bowlesia^ and Velcea\ 
sixteen genera are world-wide in their distribution, viz: Angelica^ 
Apium, Berula^ Bupleurtim^ Caruni^ Caucalis^ Crantzia^ Dau- 
cus^ Eryngium^ Hydrocotyle^ (Enanthe^ Peucedanum^ Pimpinella^ 
Sanicula^ Selinmn^ and Sium\ our twenty-two strictly North 
American genera are Aletes, Ammoselinmn^ Coloptera,, Cymop- 
ierus^ Cynosciadium^ Erigem'a, Eulophtis^ EurytcBnia^ Har- 
houria^ Lcptocaulis^ Leptotcenia^ Museniopsis^ Alusenium^ Oreoxis^ 
Orogenia, Podistera^ Polytcenia^ Pseudocymopterus^ Thaspium^ 
7'iedemannia^ Trepocarpus^ and Zizia. It will be seen that so far 
as North American Umbelliferaj hav’e received any impress from 
other continents the dominant influence has been Asiatic, at least 
25 of the genera being common to that continent. In regard to 
the 13 native speyies found also in other countries, 10 are found 
in Asia, viz: Phelloptei’us littoi'alis (common to W. North Ameri- 
ca and E. Asia), Ostnorhiza longistylis and Cryptotcenia Canadensis 
(common to E. North America and E. Asia), Sium cicutcefolium and 
Coelopleiiruni Gmelini (widely distributed throughout North Ameri- 
ca and Asia), Ligiisticum Scoticum andi Berula angust^olia (extend- 
ing also into Europe), and Hydrocotyle Asiatica and H. verticillata 
(extending from Asia and the Polynesian Islands into Africa).' 
The three remaining species, viz: Apium leptophyllum^ Crantzia 
lineata^ and Hydrocotyle Americana^ are distributed throughout the 
southern hemisphere, extending north only in Nort-h America. 
This, of course, only represents the present view regarding species. 
When those of different continents are more thoroughly compared, 
doubtless many more species will be merged. 
Comparing the North American Umbelliferai with the 
foreign representatives of the order, the North American cast is 
furnished by such forms as the abundant western display of 
acaulescent dry ground Peucedanums and their allies, species of 
Cymopterus and their allies, as well as the peculiar western 
Saniculas. 
