STANDLEY’s Ferns or GREENE Co., Mo. 115 
I have seen specimens of this species collected by Russell 
at Mine La Motte, November 10, 8 
In his remarks on Equisetum hyemale, Mr. Standley 
says: “Only this one species of Equisetum is known to 
occur in the County,” but in a list of Greene County 
plants prepared for me many years ago, Prof. Shepard 
gives two species, E. hyemale and E. sylvaticum! I am 
referring the last to EZ. arvense, as it is not likely that EZ. 
sylvaticum occurs in Greene County, and it seems almost 
impossible that EH. arvense should be absent from the 
Greene County flora. 
At the time Prof. Shepard collected Equisetum speci- 
mens, it was not known that the common evergreen 
Species of Missouri and all the northern and eastern 
United States, was E. laevigatum, Braun’s species being 
long misunderstood, and confused with a then unnamed 
annual-stemmed species of the western and southern 
United States, which was taken up as E. laevigatum, and 
Braun’s species given a new name by Eaton, EZ. hyemale 
intermedium. I am therefore referring Shepard’s £. 
hyemale, and the E. hyemale of Mr. Standley’s list, to 
LE. laevigatum, as it is more likely to be that, than the 
true L. hyemale, which is now generally conceded not to 
occur in North America.‘ 
That a better understanding of the three species in- 
volved in this obscurity may be had, I append the 
following somewhat descriptive key: 
4 16, received since the 
irc are atiaghonpane geen Sy dated Aug. 10, 19 each ¥ conasied Nak 
heh County I have re-examined with nic Maxon, ag there re no doubt 
the 
that it is E. hyemale intermedium A. A. c. of t pe 
stem fs very unlike that of E. laevigatum, as show well in the figure 
as shown by one of his co-types in the Herbarium of th 
Garden, and Eaton’s E. laevigatum was an unna nnual-stemmed 
Species, 
