54 Rhodora [Marcu 
Lycopodium clavatum, var. brevispicatum Peck, known only from 
a single station on the summit of Wallface Mt. in the Adirondacks, is 
a very remarkable plant with the short broadish leaves crowded and 
incurved much as in L. Selago, var. appressum Desv., the peduncles 
3.5-5.5 em. long, and the mostly solitary short blunt ellipsoid or thick- 
cylindrie spikes 1-2.5 em. long, 5-7 mm. thick. In these very thick 
and short blunt spikes it is apparently unlike any other known variety 
of L. clavatum. 
While studying the variations of Lycopodium clavatum in North 
America, we have been impressed with the fact, that nearly all the 
material in the Gray Herbarium from west of the Rocky Mountains 
differs from the common and essentially typical form of the species 
in nearly or quite lacking from the leaves of the upright branches the 
slender soft bristle, which so regularly terminates at least the young 
leaves of true L. clavatum. The typical form of the species, with the 
soft bristle terminating the leaf, extends westward to the Great Lakes; 
and there is in the Gray Herbarium a very characteristic specimen of 
it from the Cascade Mountains, latitude 49, collected by Lyall in 1859. 
But all the other specimens before us — ranging from the Aleutian 
Islands to Oregon — have the leaves of the ascending branches entire 
or subentire and mostly lacking the bristle-tip. This plant is clearly 
L. clavatum, var. “à. integerrimum: foliis omnino (caulinis quoque) 
integerrimis muticis” of Spring,? based upon Z. clavatum 8 of Hooker's 
Flora Boreali-Americana, which was described as follows: '* 8. foliis 
omnino integerrimis muticis....N. W. America, from Observatory 
Inlet, Dr. Scouler, to Stikine; and on Mount Rainier. T olmie.”’ ? 
The differential characters of the more pronounced variations of 
Lycopodium clavatum in North America, as understood by the writers, 
may be briefly summarized as follows. 
* Peduncles bearing usually 2 or more fruiting spikes, 
+ Leaves of the ascending branches bristle-tipped, ordinarily somewhat 
spreading. 
L. ctavaTUM L. Sp. ii. 1101 (1753). Eurasia. Newfoundland 
to North Carolina, west to Ontario and Michigan; also in the Cascade 
Mts. (Lyall). 
+ + Leaves of the ascending branches mostly not bristle-tipped either 
spreading or ascending. 
1 Peck, 54th Ann, Rep. N. Y. St. Mus. 162 (1901). 
? Spring, Mon. Lyc. i. 90 (1841). 
3 Hook. Fl, Bor.-Am. ii. 267 (1840). 
