HORSETAIL FAMILY. 39 
io. Equisetum variegatum Schleich. 
Variegated Equisetum. (Fig. 86.) 
Equisetum variegatum Schleich. Cat. Pl. Helvet. 27. 
1807. 
Stems slender, perennial, evergreen, 6’-18 long, 
rough, usually simple from a branched base, com- 
monly tufted, 5-10-furrowed, the stomata borne in 
regular rows. Sheaths campanulate, distinctly 
4-carinate, green, variegated with black above, the 
median furrow deep and excurrent to the teeth and 
downward to the ridges of the stem, the teeth 5-10, 
each tipped with a deciduous bristle; central cay- 
ity small, rarely wanting. 
Labrador and Greenland to the Northwest Territory, 
south to New Hampshire, western New York, Nebraska 
and Nevada. Also in Europe and Asia. May-June. 
11. Equisetum scirpoides Michx. Sedge- 
like Equisetum. (Fig. 87.) 
Equisetum scirpoides Michx. Fl. Bor. Am. 2: 281. 1803. 
Stems perennial, evergreen, very slender or filiform, 
3/-6’ long, somewhat rough, flexuous and curving, 
growing in slender tufts, mostly 6-furrowed with acute 
ridges, simple or branching from near the base. 
Sheaths 3-toothed, distinctly 4-carinate, the central 
furrow broad, the lateral narrow, the bristly teeth 
rather persistent; central cavity entirely wanting. 
On moist or wet wooded banks, Labrador to Alaska, 
south to Pennsylvania, Illinois and British Columbia. 
Also in Europe and Asia. May-June. 
Family 9. LYCOPODIACEAE Michx. Fl. Bor. Am. 2: 281. 1803. 
CLuB-—Moss FAMILY. 
Somewhat moss-like, erect or trailing terrestrial herbs with numerous small 
lanceolate or subulate simple leaves, sometimes oblong or roundish, arranged in 
2-many ranks, the stems often elongated, usually freely branching. Sporanges 
1-3-celled, solitary in the axils of the leaves or on their upper surfaces. Spores 
uniform, minute. Prothallia (as far as known) mostly subterranean, with or 
without chlorophyll, monoecious. 
Four genera and about 110 species. Besides the following, Psz/o/wm occurs in Florida, the two 
other genera only in Australia. 
1. LYCOPODIUM IL, Sp) Ll woos 753: 
Perennial plants with evergreen 1-nerved leaves arranged in 4-16 ranks. Sporanges 
coriaceous, flattened, reniform, 1-celled, situated in the axils of ordinary leaves or in those 
of the upper modified, bract-like ones, which are imbricated in sessile or peduncled 
spikes, opening transversely into 2 valves, usually by a line around the margin. Spores all 
of one kind, copious, sulphur-yellow, readily inflammable from the abundant oil they contain. 
{[Greek, meaning wolf’s-foot, perhaps in allusion to the branching roots of some species. ] 
About 100 species of wide geographic distribution, the largest occurring in the Andes of South 
America and in the Himalayas. 
