20 
The Ohio Naturalist. 
[Vol. XIII, No. 1, 
Several years ago, while visiting the New York Bot. Garden, 
the late Dr. Underwood showed the writer specimens of E. laevig- 
atum A. Br. from Engelmann’s collections made at St. Louis in 
August, 1843. These plants also had the rigid points on the 
cones. They are probably from the same material from which 
Braun received his specimens. 
Specimens of E. hyemale intermedium in the National Herba¬ 
rium at Washington and at the Missouri Bot. Garden, including 
cotvpes named by Eaton himself, agree closely with Englemann’s 
specimens of E. laevigatum. Some of the specimens renamed by 
Eaton were originally labeled E. laevigatum. One of Eaton’s 
cotypes of E. hyemale intermedium at the Mo. Bot. Garden 
appears to the writer to be the same in all essential respects as 
Engelmann’s laevigatum material. The specimens was originally 
labeled E. laevigatum. 
There can be no mistake as to the meaning of Braun’s original 
description of E. laevigatum as translated by Engelmann and 
printed in The American Journal of Science and Artsf. 
The species is characterized as follows: 
“Equiseta stichopora (winter-Equiseta). Stomata disposed in 
two distinct ranges on each side of the groove; each range formed 
by one or more rows of stomata (All known species in this division 
have hardy evergreen stems). 
Homophvadica. 
Ranges of stomata consisting each of one row. 
7. E. laevigatum A. Braun. 
“Stems tall, erect, simple or somewhat branching; carinae 
convex, obtuse, smooth; grooves shallow on each side; with a single 
series of stomata, vallecular air cavities small, the carinal ones 
very minute; central cavity large; sheaths elongated, adpressed, 
with a black limb, consisting of about twenty-two leaves with one 
carina at base and (by the elevation of the margin and depressions 
of the middle) two towards the point; points linear—subulate, 
sphacelate, caducous, leaving a truncate-dentate margin to the 
sheath; branches somewhat rough; sheaths with about eight 
indistinctly 3-carinate leaves; points persistent subulate, sphace¬ 
late with a narrow membranous margin. 
Hab. On poor clayey soil with Andropogon and other coarse 
grasses at the foot of the rocky Mississippi hills, on the banks of 
the river below St. Louis. 
tB ra u n, Alexander. A monography of the North American species of 
the genus Equisetum; translated from the author’s manuscript, and with 
some additions, by George Engelmann. Am. Jour. Sci. and Arts 46:81-9G 
(April, 1844.) 
