384 Class XXIV. Order i. 



EQ.UISETUM SYLVATICUM. L. Wood Horsetail, 



Branches compound, curving downward, rough. 



The fertile stems are erect, round, furrowed, jointed. Joints 

 invested with large, loose sheaths, which divide into a number 

 of broad teeth at top. Brandies very slender, in a whorl pro- 

 ceeding from the upper joint, immediately below the sheath, 

 divaricated and curving downward. The second joint from the 

 top is furnished with a whorl of shorter branches, and sometimes 

 also the third. Ament ovate, terminal, composed like the rest, 

 of peltate, hexagonal scales. The barren stems are smaller and 

 higher, their joints all furnished with whorls of branches, which 

 are much longer, and considerably subdivided Low grounds, 

 Roxbury, Cambridge. Perennial. 



EQJJISETUM SCIRPOIDES. MX. Small Horsetail. 



Stems simple, ascending, smooth, filiform, with spikes 

 at top ; sheaths three toothed, blackish, teeth awued, 

 the tips caducous. 



A very small species, not larger than the leaves of the fore- 

 going. Stems simple, crowded, three or four inches high. In 

 Plainfield. Dr. Porter. 



442. LYCOPODIUM. 



LVCOPODIUM OAB.OLINIANUM. Willd. Carolina Club Moss. 

 Stem creeping ; leaves two ranked^ spreading, lan- 

 ceolate ; peduncle erect, solitary, elongated, one spiked; 

 bractes sublanceolate. 



A creeping species, keeping close to the ground in muddy 

 soils, the peduncle being the only erect part. This is long, slen- 

 der, and bears a single spike. Found at Sandwich. 



LYCOPODIUM CLAVATUM. JL. Common Club Moss. 



Leaves scattered, ending in hairs ; spikes in pairs 

 cylindrical, pedimculated, the scales ovate, acuminate, 

 toothed. 



Stems very long, trailing and rooting. Leaves linear-lanceo- 

 late, spreading, nerveless, ending in a curved bristle. Flower- 



