182 COMMON CANADIAN WILD PLANTS. 



The fertile stems will have almost withered away by the time 

 the sterile ones appear. These latter are of the same thickness 

 as the fertile ones, but they are very much taller and are green 

 in colour. Observe, also, the grooving of the sterile stem, and 

 the whorls of 4-angled branches produced at the nodes. 



E. limo'sum, L., produces its spores in the summer. The 

 stems are all of one kind, or at all events are produced con- 

 temporaneoiisly, and after fruiting produce upright branches. 

 They are, also, slightly many-furrowed. The sheaths have com- 

 monly about 18 dark-brown stiff short teeth. In shallow water. 



The two species just described are annual ; the following are 

 evergreen, surviving the winter. The terminal spike is tipped 

 with a small rigid point. 



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. 



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. 



E. scirpoi'des, Michx. Stems slender, very numerous in <i 

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

 Sheaths 3-toothed. Wooded hill-sides. 



OKDER CIX. LYCOPODIA'CE^. (CLUB-Moss F.) 



Chiefly moss-like plants ; often with long running and branch- 

 ing stems, the sporangia solitary in the axils of the mostly awl- 

 shaped leaves. 



Synopsis of the Genera. 



1. Lycopo'dium. Spore-cases of one kind only, in the axils of the upper 



awl-shaped leaves; 2-valved, kidney -shaped. Chiefly evergreen plants. 

 (See Part I., sections 332-335.) 



2. Selagiiil'la. Spore-canes of two kinds: one like those of Lycopodium, 



containing very minute spores, the other 3-4-valved, and containing a 

 few lar^e spores. The two sorts intermingled, or the latter in the lower 

 axils of the spike. Little moss-like tufted evergreens. 



