Pl.end.cr, 4. EQUISET. 22. Eqiiisetum. 27 



6. Equ'isetum palustre. Marsh horsetail. 

 Stem branchy, furrowed, smoothish ; branches fivesided, 



simple, erect; spike terminal. 



E. palustre, Ger.em. 1114; Lin. S. P. I5ld. 

 E. palustre minus. Park. I'lOO. 

 E. palustre, iJaa iS'^n. 131, 9. 



Spongy bogs; perennial; Jiaie and July. 



Stem deep furrowed, branched in every part ; Iranchei 

 erect, long, simple, minutely scabrous; sheaths greenish, 

 the edges whitish ; spike terminating the stem, single, 

 blackish, slender, formed of a few large, distant scales. 



^. tenidssimum. Branches very long and slender. 



E. palustre, tenuissimis et longissimis setis, Raii Syn, 131, 6. 



y. polystachion. Upper branches, as well as the stem, 

 terminating in a spike. 



E. palustre, minus, poljstachion, Raii Syn, 131, 7. 



7. Equisetum sylvaticum. Wood horsetail. 

 Stems doubly branched; branches rather rough, bowed 



down, fom'sided ; second branches rather threesided. 



E. sjlvaticum, Ran Syn. 130, 4 ; Ger. cm. 1114 ; Lin. S. P. 1316. 

 E. omnium minus tenuifolium, Park. 1201. 

 E. sjlvaticura, Tabern. Ic. 253. 



Moist woods and banks of rivulets ; per. April and May. 



Root creeping; stems erect, a foot high, very much 

 branched, terminated by a single spike; bra?iches furrowed; 

 spike footstalked, upright, ovate, blunt, brown, tessulated. 



P. procumhens. Branches pointing all one way. 



E. sylvaticum, procumbens, sctis uno verso dispositis, Raii Syn. 131, i. 



Fam. V. 5. CHARADES. 



Fructification monoicous, axillary; bractece 2, 3, or 4; 

 perigoniiim transparent, fivecut ; anther ? sessile, single, 

 globular, bursting in three or four parts; pollen P conglo- 

 merate with spiral threads; mit barked, crowned, turbi- 

 nate, sessile, spirally streaked, onecelled, many-seeded ; 

 seeds \eiy minute, spherical — Plants submersed, verticillate, 

 fistulous, smooth or covered with a corklike bark, very 

 brittle when dry. 



23. CHARA. Vaillant. M.R.A. 1719. StoneworL 



No other genus in this order. 



