16 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Musenium Nutt. = Musineon Raf. 
Osmorhiza Raf. = Washingtonia Raf. 
Peucedanum L. = excluded, 
Phellopterus Benth. = Glehnia F. Schmidt. 
Selinum L. = excluded. 
Tiedemannia DC. = Oxypolis Raf. 
Velaea DC. = excluded. 
In the Revision the genera were arranged in a sequence which was 
somewhat artificial, while in the Monograph the more natural sequence 
of Drude is followed. 
In connection with the descriptions of genera and species, only what 
we regard as the essential synonymy is cited, in all cases including the 
first use of the name. Of these references there are nearly 800, and 
with the exception of 5 all have been verified. In the process of this 
verification we have been more impressed than ever by the numerous 
errors which creep into unverified citations and are thus indefinitely 
perpetuated. 
The following references have not been verified by the authors: 
Anthriscus Bernh. Syst. Verz. Ery. 115. 1800. 
Berula Hoffm. in Bess. Enum. Pl. Volh. 44. 1821. 
'Bifora Hoffm. Umb. Gen. ed, 2. 191. 1816. 
'Bupleurum protractum Hoffmgg. & Link, Fl. Port. 2:387. 1820. 
Hydrocotyle natans Cyrilli, Pl. Rar. Neap. 1:20. 1792. 
The type locality is also given wherever the information is accessi- 
ble, and we have thought it best to quote the original statement in 
reference to it, with such explanatory remarks as seem necessary to 
make it more definite. The collector and present location of the type 
specimens are also named, so far as known. 
As there is at present considerable discussion regarding the manner 
of selecting the type species of a genus, we have given some attention 
to the subject. With the exception of the Linnaean genera, the results 
are the same whether the first species is selected as the type or the 
method of residues is used. In this connection the data given below 
are of interest. Of the 26 Linnaean genera, 3 do not at present con- 
tain the first species originally cited by Linnaeus, viz, Apiwm, Caucalis, 
and Ligusticum. 
1 References verified by Dr. William Trelease. 
