448 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
simply because it is a homonym, all will admit the necessity of doing so since the 
Polytaenium Desy., long relegated to synonymy, should doubtless be restored. 
The genus contains a single species and a variety. 
Pleiotaenia nuttallii (DC.) C. & R. 
Polytaenia nuttallii DC. Mém. Ombell. 54. pl. 75. 1829. 
Pleiotaenia nuttallii texana ©. & R. 
Polytaenia nuttallic tecana C. & R. Contr. Nat. Herb. 7: 192. 1899. 
PSEUDOTAENIDIA Mackenzie, Torreya 3: 158. 1903. 
‘This genus has been described since the publication of the Mono- 
graph, and is represented by the following species from the moun- 
tains of Virginia and West Virginia: 
Pseudotaenidia montana Mackenzie, loc, cit. 159. 
LEPTOTAENIA Nutt. in Torr. & Gr, Fl], 1: 629, 1840, 
Cusickia Jones, Contr. Western Bot. 12: 39. 1908. 
In the generic description published in the Monograph, the range in 
number of oil tubes was not changed from its original statement. The 
newer species showed that this range must be changed from *‘'3 to 6 
in the intervals,” to read ‘* 1 to 6 in the intervals, and sometimes none 
(L. anomata).” 
Mr. Jones has established a new genus Cusickia, based upon our 
LI. minor. A reexamination of the genus has not shown us any more 
than specitic differences between this species and the other species of 
Leptotaenia; and Mr. Jones has not called attention to the differential 
characters he has in mind. 
COGSWELLIA Sprengel in Roem. «& Schult. Syst. Veg. 6: xlvili. 1820. 
Lomatium Raf. in Journ. Phys. 89: 101. 1819, not Lomaria R. Br. 1810. 
In the preparation of our Monograph the fact that Lomatium Raf. 
was a homonym escaped us, though made evident by Schultes’s observa- 
tion appended to Sprengel’s description: ‘* Nomen mutandum, cum jam 
sit Lomatia Rob. Brown.” In consequence of this, Mr. Marcus E. 
Jones” has very properly transferred to Cogswellia most of our 
species of Lomatium. We append a list of the species of Cogswellia, 
with such modification of the list of Mr. Jones as seems to us neces- 
sary. We can not follow him, however, in the merging of Euryptera 
Nutt. and Cynomarathrum Nutt. under Cogswellia, for the general 
reason intimated under Cymopterus above. 
Cogswellia alata C. & R. 
Lomatium alatum C. & R. Contr. Nat. Herb. '7: 228. 1900. 
Cogswellia ambigua (Nutt.) Jones, Contr. Western Bot. 12: 52. 1908. 
«Contr. Western Bot. 12: 1908. 
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