LYCOPODIACE^J. 269 



* * Stems evergreen, all similar, not branching, or only ellgntly so. 



6. E. hyema'le, L. (SCOURING RUSH.) Stems stout and 

 tall. Sheaths elongated, with a black girdle above the base, 

 and about 20 narrow linear teeth, 1-keeled at the base, and 

 with awl-shaped deciduous points. Wet banks. 



7. E. Iseviga'tum, Braun. Stems 1-4 feet high, rather 

 slender, pale green, 14-30-grooved, the ridges almost smooth. 

 Sheath slightly enlarged upward, with a black girdle at the 

 base of the white- margined teeth. N.W. 



8. E. variega'tum, Schleicher. Stem slender, in tufts, 

 with 5-10 grooves, ascending, 6-18 inches high. Sheaths 

 green, variegated with black above, 5-10 toothed. Shores 

 and river-banks. 



9 E. SCirpOi'deS, Michx. Stem slender, very numerous in 

 a tuft, filiform, 3-6 inches high, curving, mostly 6-grooved. 

 Sheaths 3-toothed. Wooded hill-sides. 



OBDEB CXIV. LYCOPODIA'CE^. (CLUB-MOSS F. ) 



Chiefly moss-like plants ; often with long running and 

 branching stems, the sporangia solitary in the axils of the 

 mostly awl-shaped leaves. Spores all of one kind. 



LICOPO'DHIM, L. CLUB-Moss. 



* Spore-cases in the axils of the ordinary dark-green rigid lanceolate 



leaves. 



1. L. sela'gO, L. Stems erect and rigid, forking, forming 

 a level-topped cluster. Leaves uniform. Atl. Prov. and 

 northward. . 



2. L. lucid' ulum, Michx. Stems less rigid than the last, 

 forking. Leaves at first spreading ; then deftexed, arranged 

 in a/ternate zones of longer and shorter leaves. 



* * Spore-cases only in the axils of the upper bract-like leaves, forming 



a spike. 

 *- Leaves of the spike not very different from those of the stem. 



3. L. inunda'tum, L. A low plant with weak, creeping, 

 sterile stems, and solitary erect fertile stems bearing a 



